1 [noncount] : physical weakness : the quality or state of being frail
▪ the old man's frailty ▪ the frailty of her voice/health2 : weakness of character that causes a person to do things that are morally wrong [noncount] ▪ He is not immune to human frailty. [=he sometimes fails to do what is fair, honest, etc.] [count] ▪ We can no longer be surprised by the frailties of our political leaders.
▪ the old man's frailty ▪ the frailty of her voice/health