Synonyms

Impair means to weaken, damage, or make worse. Injure is the correct synonym as both involve causing harm or damage. Capable, special, and sociable are all positive attributes unrelated to harm. Heal is an antonym - it means to cure or repair, which is the opposite of impair.

Impolitic means lacking good judgment or wisdom, often in a way that is politically or socially disadvantageous. Unwise is the direct synonym. Prudent is actually an antonym, while political only relates to government without capturing the 'unwise' meaning.

Importune means to ask or request persistently or urgently, sometimes to the point of annoyance. Request is the closest match among the options. Command, demand, and order imply authority that importune lacks.

Impregnable means unable to be captured or conquered, completely secure against attack. Invincible is the perfect synonym. Imperishable means lasting forever, which is different. Beatable and vulnerable are antonyms.

Impugn means to challenge, criticize, or call into question someone's actions, character, or motives. Criticize is the correct match. Promote, praise, and laud are all antonyms. Recommend suggests approval rather than questioning.

Inadvertence means the quality of being unintentional or accidental, lacking attention or care. Unintentional is the direct synonym. Planned and intentional are antonyms. Adventurous is unrelated to the concept of accidental oversight.

Incarcerate means to imprison or confine someone in a prison or jail. Imprison is the exact synonym. Release and free are direct antonyms. Impregnate refers to fertilization, and decapitate means to behead, both unrelated.

Immune means protected or secure from disease, infection, or influence. Secure is the correct synonym as it captures the sense of protection. Imprison, impure, and impute are unrelated meanings. The prefix 'im-' here means 'not' susceptible to.

Incandescent means emitting light, brilliant, or extremely bright. Brilliant is the perfect synonym. Blighted, dull, and dark are all antonyms describing the opposite. Cannibalistic is completely unrelated to light or brightness.

Incendiary means inflammatory, causing excitement or violence, literally 'causing fire.' Provocative is the closest match as it captures the tendency to stir up conflict. Interrogative relates to questioning. Extinguishable is an antonym.

Inane means silly, foolish, or lacking substance. Stupid is the correct synonym. Brilliant, bright, and genius are all antonyms. Genuine means authentic, which is unrelated to foolishness or silliness.

Incipient means just beginning to appear or develop, in an initial stage. Nascent is the perfect synonym meaning 'just coming into existence.' Flourishing suggests full development. Grown up, old, and experienced are antonyms.

Impertinent means not showing proper respect. So, insolent is the word which is closest in meaning.

Incisive means sharp, keen, or penetrating, especially in thought or expression. Sharp is the direct synonym. Blunt is the antonym. Satisfactory and improbable don't capture the penetrating quality. Invaluable means priceless, which is unrelated.

Bigotry means prejudice or intolerance.