See unsound in Webster's New World Roget's A-Z Thesaurus II
adjective
Not physically strong:
decrepit, delicate, feeble, flimsy, fragile, frail, infirm, insubstantial, puny, unsubstantial, weak, weakly. See strongAfflicted with or exhibiting irrationality and mental unsoundness:
brainsick, crazy, daft, demented, disordered, distraught, dotty, insane, lunatic, mad, maniac, maniacal, mentally ill, moonstruck, off, touched, unbalanced, wrong. (Informal) bonkers, cracked, daffy, gaga, loony. (Slang) bananas, batty, buggy, cuckoo, fruity, loco, nuts, nutty, screwy, wacky. (Chiefly British) crackers. (Law) non compos mentis. Idioms: around the bend, crazy as a loon, mad as a hatter, not all there, nutty as a fruitcake, off (or out of) one's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See saneContaining fundamental errors in reasoning:
fallacious, false, illogical, invalid, sophistic, specious, spurious. See correct, trueContaining an error or errors:
erroneous, fallacious, false, inaccurate, incorrect, mistaken, off, untrue, wrong. Idioms: all wet, in error, off base, off (or wide of) the mark. See correctNot wise:
ill-advised, ill-considered, impolitic, imprudent, indiscreet, injudicious, unwise. See wise
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