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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. 2016.
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Examples from the Web for unsound
Contemporary Examples
Historical Examples
  • A Puritan would have found it savory, even where it was unsound.

    Studies of Christianity James Martineau
  • They look upon her, who indulges it, as in an unsound condition.

    The Young Maiden A. B. (Artemas Bowers) Muzzey
  • An unsound text, the insertion of before the clause, sent Lessing on a wrong track.

    Ephemera Critica John Churton Collins
  • Martin says that's unsound, and the 'Book of Universal Brotherhood' rot.

    Fraternity John Galsworthy
  • It is furthermore claimed that the number of suicides are increased by unsound sexual relations.

    Woman and Socialism August Bebel
  • Nay, it will not bear to be tried by any principle, sound or unsound.

  • Bois l'Hery's horses were unsound, Schwalbach's gallery was a swindle, Moessard's articles a recognised blackmail.

    The Nabob Alphonse Daudet
  • A bequest to them was disputed on the grounds that the testator was of unsound mind.

    Tommy and Co. Jerome K. Jerome
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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