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[uhn-sound] /ʌnˈsaʊnd/
adjective, unsounder, unsoundest.
not sound; unhealthy, diseased, or disordered, as the body or mind.
decayed or impaired, as timber or foods; defective.
not solid or firm, as foundations.
not well-founded or valid; fallacious:
an unsound argument.
easily broken; light:
unsound slumber.
not financially strong; unreliable:
an unsound corporation.
Origin of unsound
1275-1325; Middle English; see un-1, sound2
Related forms
unsoundly, adverb
unsoundness, noun
1. infirm, sick, ill, unhealthy. 2. rotten, unwholesome. 4. false, erroneous, faulty. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for unsound
  • unsound fishing and farming practices are straining the seas' resources.
  • By all reckoning, the bumblebee is aerodynamically unsound and shouldn't be able to fly.
  • Risk management became a euphemism for continued justification of unsound practices.
  • It is a judgment, a judgment thrice removed, and probably an unsound one.
  • If they find the company unsound they can pull out any time they want.
  • But it is to suggest that the difference between sound versus unsound policy is not a simple matter of more versus less science.
  • Speculators were buying up even gutted shells, even tenements so unsound they would require a fortune to fix.
  • Skim-coating can rescue a wall with numerous hairline cracks but cannot help a wall if the plaster is loose or unsound.
  • The concept of unsafe and unsound banking practices is one which touches upon the entire operation of a bank.
  • Such covenants will be criticized as an unsafe and unsound banking practice.
British Dictionary definitions for unsound


diseased, weak, or unstable: of unsound mind
unreliable or fallacious: unsound advice
lacking solidity, strength, or firmness: unsound foundations
of doubtful financial or commercial viability: an unsound enterprise
(of fruit, timber, etc) not in an edible or usable condition
Derived Forms
unsoundly, adverb
unsoundness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unsound

early 14c., of persons, "diseased, wounded," from un- (1) "not" + sound (adj.). Cf. Middle Low German unsund, Middle Dutch ongesont, German ungesund. Meaning "morally corrupt" is recorded from c.1300; that of "not mentally healthy" is from 1540s. Sense of "not based on reasoning or fact" is attested from 1590s.

Online Etymology Dictionary, © 2010 Douglas Harper
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