Something peculiar is notably unusual. If your friend starts saying strange things you don't understand, ask her why she's suddenly become peculiar.

Peculiar comes from the Latin peculiaris, meaning one's own, or personal. In English, it originally meant belonging to one person, private, like your fondness for your peculiar hairbrush. It also had the meaning of something unlike others, special, or remarkable. Eventually we mostly stopped using it for belongings, instead using peculiar to mean unusual or odd.

Definitions of peculiar

adj beyond or deviating from the usual or expected

“the peculiar aromatic odor of cloves”
curious, funny, odd, queer, rum, rummy, singular
strange, unusual
being definitely out of the ordinary and unexpected; slightly odd or even a bit weird

adj markedly different from the usual

“a peculiar hobby of stuffing and mounting bats”
“"a man...feels it a peculiar insult to be taunted with cowardice by a woman"-Virginia Woolf”
not usual or common or ordinary

adj unique or specific to a person or thing or category

“a peculiar bond of sympathy between them”
“an expression peculiar to Canadians”
“rights peculiar to the rich”
particular, special
(sometimes followed by `to') applying to or characterized by or distinguishing something particular or special or unique

adj characteristic of one only; distinctive or special

“"the peculiar character of the Government of the U.S."- R.B.Taney”
typical or distinctive

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