645+ Insightful Adjectives that Start with I

Adjectives that start with I, whether positive or negative, can help bring better descriptions to your writing or day-to-day conversations.

In this article, we’ll explore hundreds of I adjectives that you can start using immediately!

Adjectives that Start with I

Adjectives that Start with I

Adjectives in English are used before a noun or pronoun to describe a person, place, or thing.

They make the noun more descriptive for whoever is listening to or reading the sentence and help to answer questions.

These questions might be:

  • What kind?
  • Whose is it?
  • Which is it?

Here is a list of more adjectives that start with I:

  • Icky
  • Iconoclastic
  • Icy
  • Icy-Cold
  • Ideal
  • Idealistic
  • Identical
  • Identifiable
  • Idiosyncratic
  • Idiotic
  • Idyllic
  • Ignorable
  • Ignorant
  • Ill
  • Ill-Equipped
  • Ill-Fated
  • Ill-Humored
  • Ill-Informed
  • Illegal
  • Illegitimate
  • Illicit
  • Illiterate
  • Illogical
  • Illuminating
  • Illusive
  • Illustrious
  • Imaginable
  • Imaginary
  • Imaginative
  • Imitative
  • Immaculate
  • Immanent
  • Immature
  • Immeasurable
  • Immediate
  • Immense
  • Imminent
  • Immobile
  • Immodest
  • Immoral
  • Immortal
  • Immovable
  • Impartial
  • Impassable
  • Impassioned
  • Impatient
  • Impeccable
  • Impenetrable
  • Imperative
  • Imperceptible
  • Imperceptive
  • Imperfect
  • Imperial
  • Imperialistic
  • Impermeable
  • Impersonal
  • Impertinent
  • Impervious
  • Impetuous
  • Impish
  • Implausible
  • Implicit
  • Implosive
  • Impolite
  • Imponderable
  • Important
  • Imported
  • Imposing
  • Impossible
  • Impoverished
  • Impractical
  • Imprecise
  • Impressionable
  • Impressive
  • Improbable
  • Improper
  • Improvable
  • Improved
  • Improving
  • Imprudent
  • Impudent
  • Impulsive
  • Impure
  • Inaccessible
  • Inaccurate
  • Inactive
  • Inadequate
  • Inadmissible
  • Inadvertent
  • Inadvisable
  • Inalienable
  • Inalterable
  • Inane
  • Inanimate
  • Inapplicable
  • Inappropriate
  • Inapt
  • Inarguable
  • Inarticulate
  • Inartistic
  • Inattentive
  • Inaudible
  • Inauspicious
  • Incalculable
  • Incandescent
  • Incapable
  • Incendiary
  • Incessant
  • Incidental
  • Inclusive
  • Incoherent
  • Incomparable
  • Incompatible
  • Incompetent
  • Incomplete
  • Incomprehensible
  • Inconceivable
  • Inconclusive
  • Incongruent
  • Incongruous
  • Inconsequential
  • Inconsiderable
  • Inconsiderate
  • Inconsistent
  • Inconsolable
  • Inconspicuous
  • Incontrovertible
  • Inconvenient
  • Incorrect
  • Incorrigible
  • Incorruptible
  • Increasing
  • Incredible
  • Incredulous
  • Incremental
  • Incurable
  • Indecent
  • Indecipherable
  • Indecisive
  • Indefensible
  • Indefinable
  • Indefinite
  • Indelible
  • Independent
  • Indescribable
  • Indestructible
  • Indeterminable
  • Indeterminate
  • Indian
  • Indicative
  • Indifferent
  • Indigenous
  • Indignant
  • Indigo
  • Indirect
  • Indiscreet
  • Indiscriminate
  • Indispensable
  • Indisputable
  • Indistinct
  • Individual
  • Individualistic
  • Indivisible
  • Indomitable
  • Indonesian
  • Inductive
  • Indulgent
  • Industrial
  • Industrious
  • Ineffective
  • Ineffectual
  • Inefficient
  • Inelegant
  • Ineloquent
  • Inequitable
  • Inert
  • Inescapable
  • Inevitable
  • Inexact
  • Inexcusable
  • Inexhaustible
  • Inexpedient
  • Inexpensive
  • Inexplicable
  • Inexpressible
  • Inexpressive
  • Inextricable
  • Infallible
  • Infamous
  • Infantile
  • Infatuated
  • Infected
  • Infectious
  • Inferior
  • Infernal
  • Infinite
  • Infinitesimal
  • Inflamed
  • Inflammable
  • Inflammatory
  • Inflatable
  • Inflated
  • Inflexible
  • Influential
  • Informal
  • Informative
  • Informed
  • Infrequent
  • Infuriated
  • Infuriating
  • Ingenious
  • Ingenuous
  • Inglorious
  • Ingratiating
  • Inhabitable
  • Inharmonious
  • Inherent
  • Inhibited
  • Inhospitable
  • Inhuman
  • Inhumane
  • Initial
  • Injudicious
  • Injured
  • Injurious
  • Innate
  • Inner
  • Innocent
  • Innocuous
  • Innovative
  • Innumerable
  • Inoffensive
  • Inoperable
  • Inoperative
  • Inopportune
  • Inordinate
  • Inorganic
  • Inquiring
  • Inquisitive
  • Insane
  • Insatiable
  • Inscrutable
  • Insecure
  • Insensible
  • Insensitive
  • Inseparable
  • Inside
  • Insidious
  • Insightful
  • Insignificant
  • Insincere
  • Insipid
  • Insistent
  • Insolent
  • Inspirational
  • Inspired
  • Inspiring
  • Instant
  • Instantaneous
  • Instinctive
  • Instinctual
  • Institutional
  • Instructive
  • Instrumental
  • Insubordinate
  • Insufferable
  • Insufficient
  • Insulting
  • Insurmountable
  • Intangible
  • Integral
  • Intellectual
  • Intelligent
  • Intelligible
  • Intended
  • Intense
  • Intensive
  • Intentional
  • Interactive
  • Interchangeable
  • Interdepartmental
  • Interdependent
  • Interested
  • Interesting
  • Interior
  • Intermediate
  • Intermittent
  • Internal
  • International
  • Interpersonal
  • Interracial
  • Intestinal
  • Intimate
  • Intimidating
  • Intolerable
  • Intolerant
  • Intransigent
  • Intravenous
  • Intrepid
  • Intricate
  • Intrigued
  • Intriguing
  • Intrinsic
  • Introductory
  • Introspective
  • Introverted
  • Intrusive
  • Intuitive
  • Invalid
  • Invaluable
  • Invasive
  • Inventive
  • Invigorating
  • Invincible
  • Invisible
  • Invited
  • Inviting
  • Involuntary
  • Involved
  • Inward
  • Irascible
  • Irate
  • Iridescent
  • Irish
  • Irksome
  • Iron-Fisted
  • Ironic
  • Irrational
  • Irreconcilable
  • Irrefutable
  • Irregular
  • Irrelative
  • Irrelevant
  • Irremovable
  • Irreparable
  • Irreplaceable
  • Irrepressible
  • Irresistible
  • Irresponsible
  • Irretrievably
  • Irreverent
  • Irreversible
  • Irrevocable
  • Irritable
  • Irritated
  • Irritating
  • Isolated
  • Italian
  • Itchy
  • Itty-Bitty

Positive Adjectives that Start with I

Adjectives will generally fall in either the positive or negative category of words.

Positive adjectives that start with I might be:

Influential. Example: That book was very influential.
Inspired: Example: That song was quite inspired.

Here is a list of more positive I adjectives:

  • Ideal
  • Idealistic
  • Identifiable
  • Illuminating
  • Imaginable
  • Imaginative
  • Immaculate
  • Immense
  • Immortal
  • Impassioned
  • Impeccable
  • Imperial
  • Important
  • Imposing
  • Impressive
  • Improvable
  • Improved
  • Inarguable
  • Incandescent
  • Inclusive
  • Incorruptible
  • Increasing
  • Incredulous
  • Independent
  • Indestructible
  • Indispensable
  • Individual
  • Indivisible
  • Indomitable
  • Indulgent
  • Industrious
  • Inexhaustible
  • Inexpensive
  • Infallible
  • Infinite
  • Influent
  • Influential
  • Informal
  • Informed
  • Innocent
  • Innocuous
  • Inquiring
  • Inquisitive
  • Inseparable
  • Insightful
  • Inspirational
  • Inspired
  • Instant
  • Instinctive
  • Instinctual
  • Instructive
  • Instrumental
  • Intact
  • Integral
  • Integrated
  • Intellectual
  • Intelligent
  • Intended
  • Interchangeable
  • Interested
  • Interesting
  • Intimate
  • Intrepid
  • Intriguing
  • Intrinsic
  • Intuitive
  • Invaluable
  • Inventive
  • Invincible
  • Inviting
  • Involved
  • Irresistible

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Negative Adjectives that Start with I

You can also use negative adjectives that start with I to describe a noun.

Below are a few examples:

Immature. Example: The child acted very immature.
Impatient. Example: The mother became impatient with her child.

Here is a list of more negative adjectives that start with I:

  • Icy
  • Idiotic
  • Ignorant
  • Ignored
  • Ill
  • Ill-Fated
  • Illegal
  • Illegible
  • Illegitimate
  • Illicit
  • Illogical
  • Immature
  • Immeasurable
  • Immodest
  • Immoral
  • Immovable
  • Impassable
  • Impatient
  • Impenetrable
  • Imperfect
  • Imperialistic
  • Impersonal
  • Impetuous
  • Impious
  • Implausible
  • Implosive
  • Impolite
  • Imposing
  • Impossible
  • Impoverished
  • Impractical
  • Imprecise
  • Improbable
  • Improper
  • Imprudent
  • Impure
  • Inaccessible
  • Inaccurate
  • Inactive
  • Inadequate
  • Inadmissible
  • Inadvisable
  • Inane
  • Inapplicable
  • Inappropriate
  • Inapt
  • Inarticulate
  • Inattentive
  • Incoherent
  • Incompetent
  • Ineffective
  • Infamous
  • Insane
  • Insecure
  • Insidious
  • Insignificant
  • Insulting
  • Irrational
  • Irresponsible
  • Irritating

Adjectives that Start with I to Describe a Person

You want to be specific when describing a person or group of people, and adjectives that start with I are a good way to do that!

Examples you might use are:

Intelligent. Example: The professor is very intelligent.
Ideological. Example: The revolutionary was quite ideological.

Here is a list of more good I adjectives you might use to describe someone:

  • Idealistic
  • Idealized
  • Identical
  • Identifiable
  • Identified
  • Ideographic
  • Ideologic
  • Ideological
  • Idiomatic
  • Idiosyncratic
  • Idiotic
  • Idle
  • Idolized
  • Idyllic
  • Ill
  • Illegal
  • Illegitimate
  • Illicit
  • Illiterate
  • Illogical
  • Illuminated
  • Illusive
  • Illustrious
  • Imaginable
  • Imaginary
  • Imaginative
  • Imbecile
  • Imbecilic
  • Immaculate
  • Immature
  • Immodest
  • Immoral
  • Impartial
  • Impassioned
  • Impassive
  • Impatient
  • Impersonal
  • Impertinent
  • Impetuous
  • Impious
  • Imploring
  • Impolite
  • Imposing
  • Impoverished
  • Impractical
  • Impregnable
  • Impressed
  • Impressionable
  • Impressionist
  • Impressive
  • Imprisoned
  • Improbable
  • Impromptu
  • Improper
  • Improved
  • Improving
  • Improvised
  • Imprudent
  • Impudent
  • Impugnable
  • Impulsive
  • Inactive
  • Inadequate
  • Inadmissible
  • Inadvertent
  • Inadvisable
  • Inane
  • Inappropriate
  • Inarticulate
  • Inattentive
  • Inaudible
  • Inbound
  • Inbred
  • Incensed
  • Incestuous
  • Inclined
  • Incoherent
  • Incorrigible
  • Indecent
  • Indecisive
  • Indefeasible
  • Indefinable
  • Indefinite
  • Indelicate
  • Indentured
  • Independent
  • Indescribable
  • Indestructible
  • Indeterminate
  • Indian
  • Indicative
  • Indicatory
  • Indigenous
  • Indigent
  • Indirect
  • Indiscreet
  • Indiscriminate
  • Indiscriminating
  • Indisposed
  • Indisputable
  • Indistinct
  • Individual
  • Individualist
  • Individualistic
  • Individualized
  • Induced
  • Indulgent
  • Inebriated
  • Ineffable
  • Ineffectual
  • Inexact
  • Inexhaustible
  • Infantile
  • Infatuated
  • Inflexible
  • Infuriating
  • Ingenious
  • Ingrained
  • Ingratiating
  • Ingratiatory
  • Ingrown
  • Inharmonious
  • Inherent
  • Inheritable
  • Inherited
  • Inheriting
  • Inhibited
  • Inhumane
  • Initial
  • Injured
  • Injurious
  • Innocent
  • Innovative
  • Inoffensive
  • Inoperable
  • Inquiring
  • Inquisitive
  • Inquisitorial
  • Insane
  • Insatiable
  • Inscrutable
  • Insecure
  • Insensitive
  • Insidious
  • Insincere
  • Insipid
  • Insistent
  • Inspirational
  • Inspired
  • Insulting
  • Insurrectional
  • Intelligent
  • Intense
  • Intent
  • Interesting
  • Intolerant
  • Intriguing
  • Introspective
  • Introvert
  • Introverted
  • Irate
  • Irrational
  • Irresponsible
  • Irreverent
  • Irritable

FAQs

What are the most common adjectives that start with I?

Intelligent might be one of the most common adjectives starting with I which implies a person or animal is smart. Illegal is another common adjective to mean something that is against the law.

What are the least common adjectives that start with I?

Immaculate is an uncommon adjective that generally means very pure or clean. Incandescent is a kind of glowing lighting. Both of those I adjectives are less common in daily speech or writing.

What are some personality adjectives that start with I?

You can say someone is introverted when they are not very talkative or outgoing. You could also say someone is irresponsible if they don’t think much about outcomes or take ownership of their actions.

Conclusion

Adjectives are what turn your short, boring sentences into descriptive writing. Anytime you need an illuminating adjective, consider reaching for those that start with I!

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