1. Labile – easily or frequently changed
Synonyms: unstable, vacillant, mutable, unsettled, adaptable, capricious
Antonyms: balanced, fixed
Usage: The labile currency can be changed out easily when visiting a different country.
2. Pander – indulge
Synonyms: cajole, gratify, massage, please, satisfy, snow
Antonyms: dissatisfy, annoy, disappoint
Usage: Because Jim wants his son to value a dollar, he does not pander to his whims by giving him everything he wants.
3. Militate – to influence or have an effect upon
Synonyms: resist, hinder, discourage, oppose, counter, prejudice
Antonyms: reinforce
Usage: In business, the demand will usually militate the product’s price.
4. Mordant – having or showing a sharp or critical quality
Synonyms: caustic, trenchant, biting, cutting, acerbic, sardonic, sarcastic
Antonyms: vague, uncritical
Usage: The mordant mother often used harsh words that made her son cry.
5. Impel – drive, force, or urge (someone) to do something.
Synonyms: compel, constrain, oblige, necessitate, require, demand
Antonyms: discourage, dissuade, repress
Usage: Financial difficulties impelled him to desperate measures
6. Officious – offensively intrusive or interfering
Synonyms: overbearing, overzealous, dictatorial, importunate
Antonyms: self-effacing
Usage: She doesn’t like it when officious strangers try to start a conversation in the checkout line.
7. Parity – the same in nature, value, or class
Synonyms: equality, uniformity, consistency, congruence, parallelism
Antonyms: discrepancy, disproportion, contrast, deviation
Usage: As far as parity in currency, the pound is worth more than the dollar.
8. Prosaic – commonplace or dull; unimaginative
Synonyms: unimaginative, uninspired, humdrum, mundane, plodding
Antonyms: imaginative, inspired
Usage: Students were yawning during the prosaic graduation speech.
9. Rehash – to go over something again
Synonyms: restate, reuse, discuss, reiterate, repeat, rephrase
Antonyms: refuse, deny
Usage: The husband and wife seem to always rehash their arguments
10. Roister – enjoy oneself or celebrate in a noisy or boisterous way
Synonyms: celebrate, revel, carouse, frolic, romp
Antonyms: disappoint, hate
Usage: The winner couldn’t help but shout and roister when his lottery numbers were drawn.