Noah Webster
Foible
FOI'BLE, adjective Weak. [Not used.]
FOI'BLE, noun [See Feeble.] A particular moral weakness; a failing. When we speak of a man's foible in the singular, which is also called his weak side, we refer to a predominant failing. We use also the plural, foibles, to denote moral failings or defects. It is wise in every man to know his own foibles.