Synonyms:
idiosyncrasy, foible, mannerism
Meaning: a behavioral attribute that is distinctive and peculiar to an individual
Usage examples
A certain personal idiosyncrasy must be assumed at bottom, else cotton damask would be as good as silk and all men having like opportunities would be equally great.
This idiosyncrasy is brought out by social pressure, while in a state of nature it might have betrayed itself only in trivial and futile ways, as it does among barbarians.
Considering this extremely courteous idiosyncrasy of the Kid and the pride he took in it, one can perceive that the solution of the problem that was presented to him by what he saw and heard from his hiding- place in the pear that afternoon (at least as to one of the actors) must have been obscured by difficulties.