different between frailty vs unsoundness

English

Borrowed from Old French fraileté, from Latin fragilit?s. Doublet of fragility.

frailty (countable and uncountable, plural frailties)

(uncountable) The condition quality of being frail, physically, mentally, or morally; weakness of resolution; liability to be deceived.
- 1748. David Hume. Enquiries concerning the human understanding and concerning the principles of moral. London: Oxford University Press, 1973. § 36, n. 1.
  the limitations and restraints of civil government, and a legal constitution, may be defended, either from reason, which reflecting on the great frailty and corruption of human nature, teaches, that no man can safely be trusted with unlimited authority ;
Synonyms: frailness, infirmity
A fault proceeding from weakness; foible; sin of infirmity.

unsound +? -ness

unsoundness (countable and uncountable, plural unsoundnesses)

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