acute, adamant, adamantine, airy, alternate, alternating, astute, bouncing, brainy, brawny, bright, brogue, burly, callous, change, changeable, choppy, clever, convertible, cute, erratic, extravagant, fast, fickle, firm, firmed, flighty, floating, fluky, forte, frivolous, giddy, gutsy, hale, hard, hard-boiled, hard-core, hardboiled, hardcore, hardy, heady, heavy, heedless, hefty, husky, improvident, inane, incisive, inconsiderate, insouciant, keen, keener, landed, light, light-footed, light-minded, luminous, lusty, mercurial, modifiable, moodiness, mutable, nappy, nervy, nimble, oftentimes, penetrating, perspicacious, potent, powerful,
quick, quick-witted, rank, rapid, reckless, repeatedly, rigid, robust, rooted, sagacious, sharp, sharp-witted, shifty, shrewd, smart, snappy, solid, solid-state, speed, spry, stable, stalwart, stanch, stark, steadfast, steady, stiff, stout, strong, sturdy, supple, swift, thoughtless, torrential, tough, variable, versatile, vicissitudes, virile, virtual, volatile, witty