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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

adj.

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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