unsoundness

un·sound  (n-sound)

adj. un·sound·er, un·sound·est

1. Not dependably strong or solid.

2. Not physically or mentally healthy.

3. Not true or logically valid; fallacious: an unsound conclusion.

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un·soundly adv.

un·soundness n.

Thesaurus

Noun	1.	unsoundness - a condition of damage or decay condition, status - a state at a particular time; "a condition (or state) of disrepair"; "the current status of the arms negotiations" disrepair - in need of repairs decay - an inferior state resulting from the process of decaying; "the corpse was in an advanced state of decay"; "the house had fallen into a serious state of decay and disrepair" soundness - a state or condition free from damage or decay
	2.	unsoundness - a misconception that is fallacious and not true or valid; "the unsoundness of his conclusion was obvious" misconception - an incorrect conception
	3.	unsoundness - not mentally or physically healthy; "no one can be a poet without a certain unsoundness of mind" bad, badness - that which is below standard or expectations as of ethics or decency; "take the bad with the good" firmness, soundness - the muscle tone of healthy tissue; "his muscular firmness" wiseness, soundness, wisdom - the quality of being prudent and sensible