/ ˌɪdiəˈsɪŋkrəsi; NAmE / noun
[ C , U ] ( pl. -ies ) a person's particular way of behaving, thinking, etc., especially when it is unusual; an unusual feature
SYN eccentricity :
The car has its little idiosyncrasies.
► idio·syn·crat·ic / ˌɪdiəsɪŋˈkrætɪk; NAmE / adjective :
His teaching methods are idiosyncratic but successful.
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WORD ORIGIN
early 17th cent. (originally in the sense physical constitution peculiar to an individual ): from Greek idiosunkrasia , from idios own, private + sun with + krasis mixture.