bold
1 adventurous, audacious, brave, courageous, daring, dauntless, enterprising, fearless, gallant, gritty, heroic, intrepid, lion-hearted, valiant, valorous
2 barefaced, brash, brazen, cheeky, confident, feisty (informal, chiefly U.S. & Canad.) forward, fresh (informal) impudent, insolent, in-your-face (Brit. slang) pert, pushy (informal) rude, sassy (U.S. informal) saucy, shameless
3 bright, colourful, conspicuous, eye-catching, flashy, forceful, lively, loud, prominent, pronounced, salient, showy, spirited, striking, strong, vivid
Antonyms
1 & 2 conservative, cool, courteous, cowardly, faint-hearted, fearful, meek, modest, polite, retiring, shy, tactful, timid, timorous
3 dull, ordinary, pale, soft, unimaginative