"unsoundness" in the noun sense
1. unsoundness
a condition of damage or decay
2. unsoundness
a misconception that is fallacious and not true or valid
"the unsoundness of his conclusion was obvious"
3. unsoundness
not mentally or physically healthy
"no one can be a poet without a certain unsoundness of mind"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License