Brilliant

Adjective

 * 1) shining brightly
 * 2)  both light and saturated
 * 3)  having a sharp, clear tone
 * 4) of surpassing excellence (primarily UK usage)
 * 5) magnificent or wonderful (primarily UK usage)
 * 6) highly intelligent

Noun

 * 1) a finely cut gemstone, especially a diamond, having many facets

Adverbs for Brilliant
notably; amazingly; signally; socially; intellectually; dazzlingly; smartly; inexpressibly; indescribably; surprisingly; splendidly; undoubtedly; incredibly; unusually; wonderfully; ostentatiously; scintillatingly; miraculously; cleverly; ingeniously;

Synonyms for Brilliant

 * (shining brightly): glittering, shining
 * (of a colour: both light and saturated):
 * (of a voice or sound: having a sharp, clear tone):
 * (surpassing excellence): excellent, distinctive, striking, superb (primarily UK usage)
 * (magnificent or wonderful): exceptional, glorious, magnificent, marvellous/marvelous, splendid, wonderful (primarily UK usage)
 * (highly intelligent): brainy, ingenious
 * bright, glowing, luminous, scintillating, splendid, effulgent, radiant, dazzling, glorious

Antonyms for Brilliant
dull, dark, stupid.

Related terms

 * brilliance
 * brilliantine
 * brilliantness

Thesaurus
able, accomplished, adept, adroit, apt, artistic, authoritative, beaming, beautiful, bedazzling, biting, blinding, blooming, brainy, bravura, bright, bright and shining, bright-hued, brim, brink, burning, celebrated, charismatic, clean, clever, colorful, colory, competent, coordinated, coruscating, crack, crackerjack, creative, cunning, cute, daedal, dazzling, deep-colored, deft, devastating, dexterous, dextrous, diplomatic, discerning, distinguished, divine, droll, edge, effulgent, eminent, enlightened, erudite, excellent, exceptional, exotic, expert, facetious, famous, fancy, flamboyant, flaming, fringe, fulgent, fulgid, funny, garish, gay, gay-colored, gifted, glamorous, glaring, glary, glittering, glorious, glowing, good, goodish, gorgeous, graceful, handy, heavenly, hem, high-colored, humorous, humorsome, illustrious, imaginative, incandescent, ingenious, intelligent, intense, jesting, jocose, jocular, joking, joky, joshing, keen, keen-witted, killing, knowing, knowledgeable, lambent, learned, lucent, luminous, lustrous, magic, magisterial, magnificent, margin, masterful, masterly, mordant, neat, nimble, nimble-witted, no dumbbell, no mean, not born yesterday, noted, numinous, outstanding, perimeter, periphery, pointed, politic, professional, proficient, prominent, pungent, quick, quick-thinking, quick-witted, quite some, radiant, rapier-like, raving, ravishing, ready, refulgent, remarkable, renowned, resourceful, resplendent, rich, rich-colored, sage, salt, salty, scintillating, sharp, sharp-witted, shining, skillful, skirt, slick, smart, some, sparkling, splendent, splendid, splendorous, splendrous, sprightly, statesmanlike, steel-trap, striking, stunning, stylish, sublime, superb, tactful, talented, the compleat, the complete, twinkling, verge, virtuoso, vivid, well-done, whimsical, wise, witty, workmanlike

Etymology
From brillant:, from  as if *undefined:, from  berillus:, beryllus:, from   βήρυλλος:.