airheaded, birdbrained, boneheaded, brain-dead, brainless, bubbleheaded, chuckleheaded, dense, dim, dim-witted, doltish, dopey (also dopy), dorky [slang], dull, dumb, dunderheaded, empty-headed, fatuous, half-witted, knuckleheaded, lamebrain (or lamebrained), lunkheaded, mindless, obtuse, opaque, pinheaded, senseless, simple, slow, slow-witted, soft, softheaded, stupid, thick, thickheaded, thick-witted, unintelligent, vacuous, weak-minded, witless;
absurd, asinine, balmy, cockeyed, crackpot, crazy, cuckoo, daffy, daft, dippy, dotty, fool, half-baked, harebrained, insane, kooky (also kookie), loony (also looney), lunatic, mad, nonsensical, nutty, preposterous, sappy, screwball, tomfool, wacky (also whacky), zany;
SHARP-WITTED Defined for English Language Learners
Definition of sharp-witted for English Language Learners
: having or showing an ability to think and react very quickly
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