Un-sound

unsound

[uhn-sound]

Origin:
1275–1325; Middle English; see un-1, sound2

unsoundly, adverb
unsoundness, noun


1. infirm, sick, ill, unhealthy. 2. rotten, unwholesome. 4. false, erroneous, faulty.
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World English Dictionary
unsound (ʌnˈsaʊnd)
 
adj
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
 
un'soundly
 
adv
 
un'soundness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

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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