noun

1. A quirk, idiosyncrasy, or mannerism; unusual habit or way (usage is typically plural), that is slightly strange or silly.

   “Try to look past his foibles and see the friendly fellow underneath.”

2. A weakness or failing of character.

3. Part of a sword between the middle and the point, weaker than the forte.

Synonyms: fault

adjective

1. Weak; feeble.