Important Antonyms Starting with I

Idle → Active / Busy

Ignorant → Knowledgeable / Informed

Ill → Healthy / Well

Illegal → Legal / Lawful

Illiterate → Educated / Literate

Imaginative → Unimaginative / Dull

Immature → Mature / Adult

Immediate → Delayed / Gradual

Immense → Tiny / Small

Immigrate → Emigrate / Leave

Immoral → Moral / Virtuous

Immortal → Mortal / Perishable

Impartial → Partial / Biased

Important → Unimportant / Trivial

Impossible → Possible / Feasible

Improper → Proper / Appropriate

Improve → Worsen / Decline

In → Out / Outside

Inactive → Active / Energetic

Inadequate → Adequate / Sufficient

Include → Exclude / Omit

Increase → Decrease / Reduce

Independent → Dependent / Subordinate

Important Antonyms Starting with I

Indirect → Direct / Straight

Industrious → Lazy / Idle

Inequality → Equality / Fairness

Inexpensive → Expensive / Costly

Infant → Adult / Grown-up

Inferior → Superior / Excellent

Informal → Formal / Official

Innocent → Guilty / Corrupt

Inside → Outside / Exterior

Insignificant → Significant / Important

Insert → Remove / Extract

Intelligent → Stupid / Foolish

Intentional → Accidental / Unintentional

Interest → Boredom / Disinterest

Internal → External / Outer

Interrupt → Continue / Allow

Introvert → Extrovert / Outgoing

Important Antonyms Starting with I

Invaluable → Worthless / Cheap

Invisible → Visible / Seen

Invite → Refuse / Reject

Injustice → Justice / Fairness

Irregular → Regular / Normal

Irrelevant → Relevant / Pertinent

Irritate → Soothe / Please

Isolate → Unite / Join

Itemize → Generalize / Combine

Ignoble → Noble / Honorable

Illogical → Logical / Rational

Imbalance → Balance / Stability

Immodest → Modest / Humble

Impatient → Patient / Calm

Impolite → Polite / Courteous

Improperly → Correctly / Rightly

Inaccurate → Accurate / Correct

Inactive → Lively / Energetic

Incompetent → Competent / Skilled

Important Antonyms Starting with I

Incomplete → Complete / Finished

Incorrect → Correct / Right

Indecent → Decent / Respectable

Indifferent → Concerned / Caring

Indirectly → Directly / Openly

Inefficient → Efficient / Effective

Inexact → Exact / Precise

Inexperienced → Experienced / Skilled

Infrequent → Frequent / Regular

Inhospitable → Hospitable / Friendly

Initial → Final / Last

Innocuous → Harmful / Dangerous

Insane → Sane / Rational

Insecure → Secure / Confident

Inside → Exterior / Outside

Insolvent → Solvent / Wealthy

Instability → Stability / Security

Insufficient → Sufficient / Adequate

Intellectual → Ignorant / Simple

Interfere → Assist / Support

Internalize → Externalize / Ignore

Intersect → Diverge / Separate

Intolerant → Tolerant / Accepting

Intricate → Simple / Easy

Important Antonyms Starting with I

Invade → Withdraw / Retreat

Invention → Imitation / Copy

Invisible → Obvious / Evident

Irrational → Rational / Logical

Irreparable → Repairable / Fixable

Irresponsible → Responsible / Reliable

Irrevocable → Revocable / Changeable

Isolated → Connected / United

Ill-tempered → Good-natured / Pleasant

Illusive → Real / Genuine

Imitate → Create / Originate

Immobile → Mobile / Moving

Imperfect → Perfect / Flawless

Imprison → Release / Free

Incurable → Curable / Treatable

Indirectness → Directness / Straightforwardness

Injustice → Fairness / Justice

Important Antonyms Starting with J