Vocabulary and Synonyms

A barb is a sharp projection or point, typically found on fishhooks, arrows, or wire. The barb prevents the object from being easily removed once embedded. Option D correctly describes this physical feature.

An atrocity is a horrifyingly cruel or wicked act, often involving violence or suffering. It refers to brutal deeds or crimes against humanity. Option A 'brutal deed' correctly captures this meaning.

Atrophy refers to the gradual decline, wasting away, or decrease in effectiveness of something due to neglect or disease. It commonly describes muscles or organs that waste away. Option A 'wasting away' is correct.

Attentive means paying close attention to something, being alert and watchful. It describes someone who is carefully observing or listening. Option A 'alert and watchful' is the correct definition.

Attenuate means to make something thin, weak, or reduced in intensity. It can refer to physical thinning or weakening of force, effect, or substance. Option A 'make thin' correctly captures this meaning.

Attire as a verb means to dress or clothe someone in particular clothes or garments. Clothe is the direct synonym meaning to provide someone with clothing or dress them.

An attribute is a characteristic, quality, or feature that is inherent or regarded as a natural part of someone or something. Essential quality correctly captures this meaning of a defining characteristic.

Attrition refers to wearing down or grinding down by friction, or the gradual reduction of something through pressure or attack. Rubbing away by friction correctly captures the physical wearing-down meaning.

"Atypical" means not representative of a type, group, or class, hence "not normal." Distractors like "thick-skinned animal" (pachyderm) or "trip and almost fall" (stumble) are incorrect.

Audacious describes someone who is bold, daring, or willing to take risks that might seem shocking or disrespectful. Daring is the closest synonym among the options.

Augment means to make something greater in size, amount, or degree by adding to it. Increase correctly captures this meaning of making something larger or more significant.

Augury is an omen, sign, or portent of future events - historically based on observing bird behavior. Omen correctly identifies it as something believed to predict or signal what will happen.

August (when stressed on the second syllable) means majestic, impressive, or inspiring reverence and respect. Impressive correctly captures this sense of dignity and grandeur.

Auspicious means favorable, presenting good circumstances or signs for success. Favoring success correctly captures the sense of something boding well or giving promise of a positive outcome.

Austere means severely simple, strict, or stern in manner or appearance. Option A correctly captures this meaning of being forbiddingly stern or severe. Options B, C, and D define unrelated words (paleontology, provenance, and hierarchy respectively).