/ ˈfɔɪbl; NAmE / noun
a silly habit or a strange or weak aspect of a person's character, that is considered harmless by other people
SYN idiosyncrasy :
We have to tolerate each other's little foibles.
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WORD ORIGIN
late 16th cent. (as an adjective in the sense feeble ): from obsolete French , in Old French fieble , from Latin flebilis lamentable, from flere weep. This sense also formerly occurred as a sense of the word feeble and dates from the 17th cent.