Air. Atmosphere, gas; breeze, vapor, zephyr, wind; weather; appearance, aspect, manner, sort, style, way, behavior, carriage, bearing, expression, look, demeanor, mien, fashion; tune.
Airy. Aërial, thin, rare, ethereal; light, subtle, sublimated; sprightly, buoyant, vivacious, volatile, jolly, jovial, light-hearted; graceful, lithe, pliant, flexible, showy, jaunty, flaunting, garish; windy, empty.
Ant. Thick, ponderous, heavy, inert, clumsy, dull, sluggish, wooden, slow, cheerless, sullen, doleful, leaden, lugubrious.
Akin. Related, allied, homogeneous, cognate, similar, congenial, sympathetic.
Ant. Foreign, alien, hostile, heterogeneous, dissimilar.
Alacrity. Readiness, briskness, activity, quickness, willingness, promptness, compliance, cheerfulness, eagerness, gaiety, agility.
Ant. Slowness, reluctance, repugnance, aversion, refusal, shrinking, recoil, disinclination.
Alarm. Summons, tocsin, distress signal, war-cry; fear, terror, apprehension, consternation, dismay, dread, affright.
Ant. Lullaby; confidence, quiet, composure, assurance, courage.
Alert. Lively, prompt, ready, prepared, vigilant, wide-awake, bustling, active, brisk, nimble, watchful, sprightly, agile.