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   Roget’s II: The New Thesaurus, Third Edition.  1995.
 

unsound
 
ADJECTIVE:1. Containing 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 CORRECT. 2. Containing fundamental errors in reasoning: fallacious, false, illogical, invalid, sophistic, specious, spurious. See CORRECT, TRUE. 3. Not physically strong: decrepit, delicate, feeble, flimsy, fragile, frail, infirm, insubstantial, puny, unsubstantial, weak, weakly. See STRONG. 4. Afflicted 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 SANE. 5. Not wise: ill-advised, ill-considered, impolitic, imprudent, indiscreet, injudicious, unwise. See WISE.
 
 
Roget’s II: The New Thesaurus, Third Edition. Copyright © 1995 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved.

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