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Adjective enthusiastic
Synonyms: agog, alert, animate, animated, anxious, appetent, ardent, athirst, avid, breathless, devoted, dying to, eager, earnest, ebullient, fervent, fervid, fierce, fond of, gung ho, impassioned, impatient, intense, intent, interested, lively, perfervid, spirited, sprightly, thirsty, vehement, vivacious, warm, zealous
Antonyms: reluctant, unenthusiastic, uninterested
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Adjective sharp, piercing
Synonyms: acid, acute, caustic, cutting, edged, extreme, fine, honed, incisive, intense, observant, penetrating, perceptive, pointed, quick-witted, razor-sharp, sardonic, satirical, strong, tart, trenchant, unblunted
Antonyms: blunt, dull, obtuse, pointless
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Adjective intelligent
Synonyms: astute, bright, brilliant, canny, clever, discerning, discriminating, Einstein, nobody’s fool, perceptive, perspicacious, quick, sagacious, sapient, sensitive, sharp, sharp as a tack, shrewd, whiz, wise
Antonyms: idiotic, ignorant, obtuse, stupid