Relating to or characterized by individual peculiarities or distinctive characteristics; having unusual habits, behaviors, or ways of thinking that are unique to a particular person. It describes personal quirks or individual traits.
From Greek 'idiosynkrasia' meaning 'peculiar temperament,' combining 'idios' (one's own, private) and 'synkrasis' (mixture). Originally a medical term for individual constitution, it evolved to describe any distinctive personal characteristics.
Idiosyncratic has 'idio' (individual) - think of it as someone's personal 'ID card' of quirks! Like a professor who always wears mismatched socks or writes only with purple ink, idiosyncratic traits are the unique fingerprints of personality that make someone unmistakably themselves.
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