keen

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

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

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