[more peculiar; most peculiar]
1 : not usual or normal : STRANGE
It seems peculiar that he would leave town and not tell anybody.
The dog’s peculiar behavior worried them.
She got a peculiar feeling when the phone rang.
She had a peculiar expression on her face.
2 : not used before a noun, British, informal : not well : somewhat ill
He’s feeling peculiar.
of, relating to, or found in (only one person, thing, or place)
a custom peculiar to America [=a custom that is found only in America]
— peculiarly adverb
The movie has a peculiarly [=distinctively, uniquely, particularly] American quality.
He’s been behaving peculiarly. [=(more commonly) strangely, oddly]