Inaudible
(adj) too quiet to be heard Syn: silent, imperceptible Ant: audible, loud
Implausible
(adj) not believable, highly unlikely Syn: unbelievable, dubious Ant: plausible, believable
Subdued
(adj or verb) quiet, calm Syn: tranquil, restrained Ant: agitated, energetic
Audacity
(noun) boldness, often in the face of authority Syn: brazenness, impudence Ant: timidity, shyness
Proliferate
(verb) to grow in number Syn: reproduce, multiply Ant: die off, decline
Satiate
(verb) to satisfy a desire, often for nourishment Syn: fill, satisfy Ant: starve, do without
Placate
(verb) to soothe or settle Syn: appease, mollify Ant: anger, antagonize
Steadfast
(adj) not subject to change Syn: strong, resolute Ant: weak, wavering
Inconspicuous
(adj) hard to see, not noticeable Syn: hidden, concealed Ant: conspicuous, obvious
Eschew
(verb) to avoid habitually Syn: shun, abstain from Ant: seek out, pursue
Innocuous
(adj) harmless Syn: benign, inoffensive Ant: harmful, dangerous
Bellicose
(adj) warlike, aggressively violent Syn: hostile, belligerent Ant: peaceful, pacifist
Unanimity
(noun) agreement from all, complete unity Syn: accord, unison Ant: discord, disagreement
Fallacy
(noun) a false idea or argument, a lie OR a deceptive appearance Syn: mistake, error OR disguise, deceit Ant: truth, fact
Brevity
(noun) briefness Syn: terseness, compactness Ant: long-windedness, verbosity
Immutable
(adj) unchanging, stable Syn: permanent, absolute Ant: changing, mutable
Nugatory
(adj) of no importance Syn: trivial, inconsequential Ant: important, significant
Frivolous
(adj) unimportant or lacking seriousness Syn: trivial, silly Ant: serious, important
Superfluous
(adj) unnecessary or extravagant Syn: extraneous, needless Ant: necessary, integral
Extraneous
(adj) not belonging OR not an important part, not essential Syn: alien, external OR superfluous, irrelevant Ant: belonging to, fitting in OR vital, essential