a silly habit or a strange or weak aspect of a person’s character, that is considered harmless by other people synonym idiosyncrasy We have to tolerate each other's little foibles. He often writes about the workings of government and the foibles of politicians. I soon got used to his little foibles. 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.