altercation (noun)

a heated argument

synonyms: controversy, quarrel, contention

antonyms: amity, harmony, agreement

ambivalent (adj)

being uncertain; unable to decide between two opposing points of view

synonyms: indecisive

antonyms: opinionated, decisive

amicable (adj)

friendly; peaceable

synonyms: agreeable, amiable

antonyms: quarrelsome, warlike

anathema (noun)

a greatly disliked, hated person or thing; a curse, or a person cursed

synonyms: abomination, abhorrence

antonyms: blessing

apathy (noun)

lack of interest

synonyms: lethargy, unconcern, indifference

antonyms: interest, zeal, fervor

appease (verb)

to make calm of quiet; to give in to the demands of

synonyms: pacify, placate, allay

antonyms: enrage, aggravate, defy

arduous (adj)

difficult; requiring much effort; strenuous

synonyms: strenuous, laborious

antonyms: facile, easy, simple

audacity (noun)

insolence; rude boldness

synonyms: effrontery, presumption, impudence

antonyms: decorum, propriety, timidness

augment (verb)

to enlarge; to increase in amount or itensity

synonyms: expand, enhance, increase

antonyms: abate, shrivel, reduce

austere (adj)

stern, severe, plain

synonyms: ascetic, severe, abstemious

antonyms: luxurious, affable, indulgent