frailty

plural frailties

1. uncountableThe 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

   1 more example

   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.

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

   Synonyms: frailness, infirmity, foible

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