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unsound

[uhn-sound] /ʌnˈsaʊnd/
adjective, unsounder, unsoundest.
1.
not sound; unhealthy, diseased, or disordered, as the body or mind.
2.
decayed or impaired, as timber or foods; defective.
3.
not solid or firm, as foundations.
4.
not well-founded or valid; fallacious:
an unsound argument.
5.
easily broken; light:
unsound slumber.
6.
not financially strong; unreliable:
an unsound corporation.
Origin
1275-1325
1275-1325; Middle English; see un-1, sound2
Related forms
unsoundly, adverb
unsoundness, noun
Synonyms
1. infirm, sick, ill, unhealthy. 2. rotten, unwholesome. 4. false, erroneous, faulty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un sound

unsound

/ʌnˈsaʊnd/
adjective
1.
diseased, weak, or unstable of unsound mind
2.
unreliable or fallacious unsound advice
3.
lacking solidity, strength, or firmness unsound foundations
4.
of doubtful financial or commercial viability an unsound enterprise
5.
(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 un sound
unsound
c.1320, of persons, "diseased, wounded," from un- (1) "not" + sound (adj.). Cf. M.L.G. unsund, M.Du. ongesont, Ger. ungesund. Meaning "morally corrupt" is recorded from c.1300; that of "not mentally healthy" is from 1547. Sense of "not based on reasoning or fact" is attested from 1595.
Online Etymology Dictionary, © 2010 Douglas Harper
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