unsound

[uhn-sound]
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; 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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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Example sentences
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.
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