frailty

Borrowed from Old French fraileté, from Latin fragilitās. Doublet of fragility.

frailty (countable and uncountable, plural frailties)

1. (uncountable) The condition quality of being frail, physically, mentally, or morally; weakness of resolution; liability to be deceived or seduced.
   • 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 ;

   • 2011 October 29, Phil McNulty, “Chelsea 3 - 5 Arsenal”, in BBC Sport‎:

     For all their frailty at the back, Arsenal possessed genuine menace in attack and they carved through Chelsea with ease to restore parity nine minutes before half-time. Aaron Ramsey's pass was perfection and Gervinho took the unselfish option to set up Van Persie for a tap-in.

   Synonyms: frailness, infirmity

2. A fault proceeding from weakness; foible; sin of infirmity.

• frailty in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.