IPA: /ˌɪdiəʊsɪŋˈkrætɪk/
KK: /ˌɪdiəʊsɪŋˈkrætɪk/
Something that is unique or peculiar to a particular person, often in a way that is unusual or eccentric.
Her idiosyncratic style of painting makes her work stand out in the gallery.
Idiosyncratic → It is formed from "idio-" (from Greek "idios", meaning one's own or private) and "synkrasis" (meaning mixture or blending). The word describes a characteristic or behavior that is peculiar to an individual, thus reflecting their own unique mixture of traits.
Think of 'one's own' ('idio-') traits being mixed together ('synkrasis') to remember that 'idiosyncratic' refers to something unique to an individual.
No commonly confused words.