opaque

Synonyms

brain-dead, brainless, dense, doltish, dopey (also dopy), dorky [slang], dull, dumb, fatuous, half-witted, mindless, oafish, obtuse, pinheaded, senseless, simple, slow, stupid, thick, thickheaded, unintelligent, vacuous, weak-minded, witless;

Antonyms

apt, brainy, bright, brilliant, clever, fast, intelligent, keen, nimble, quick, quick-witted, sharp, sharp-witted, smart;

Near Antonyms

ingenious, resourceful;

acute, astute, discerning, insightful, keen, knowing, perceptive, sagacious, sage, sapient, savvy, wise;

cerebral, erudite, highbrow, intellectual, knowledgeable, learned, literate, scholarly, thinking, well-read;

crafty, cunning, foxy, shrewd, wily;

judicious, prudent, sane, sensible, sound;

Related Words

feebleminded, simpleminded;

foolish, idiotic, imbecile (or imbecilic), moronic;

ignorant, illiterate, lowbrow, uneducated, uninformed, unintellectual, untaught, unthinking;

absurd, asinine, balmy, cockeyed, crackpot, crazy, cuckoo, daffy, daft, half-baked, harebrained, insane, kooky, loony (also looney), lunatic, mad, nonsensical, nutty, wacky, zany;