Etymology
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foible (n.)

1640s, "weak point of a sword blade" (contrasted to forte), from French foible "a weak point, a weakness, failing," from noun use of Old French adjective feble "feeble" (see feeble). The spelling borrowed in English is obsolete in modern French, which uses faible. Extended sense of "weak point of character" is first recorded 1670s. Related: Foibles.

updated on December 11, 2014

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Definitions of foible from WordNet

foible (n.)
a behavioral attribute that is distinctive and peculiar to an individual;
Synonyms: idiosyncrasy / mannerism
foible (n.)
the weaker part of a sword's blade from the forte to the tip;
From wordnet.princeton.edu, not affiliated with etymonline.