frailty

Etymology

From Middle English frelete, frailte, from Old French fraileté, from Latin fragilitās. Doublet of fragility.

noun

1. (uncountable) The condition quality of being frail, physically, mentally, or morally; weakness of resolution; liability to be deceived.
   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 ; 1748, David Hume, Enquiries concerning the human understanding and concerning the principles of moral., London: Oxford University Press, published 1973, § 36, n. 1
   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. October 29, 2011, Phil McNulty, “Chelsea 3 - 5 Arsenal”, in BBC Sport
2. A fault proceeding from weakness; foible; sin of infirmity.