- 1strange or unusual, especially in a way that is unpleasant or worrying synonym odd a peculiar smell/taste There was something peculiar in the way he smiled. I had a peculiar feeling we'd met before. Her behavior was a peculiar mixture of the sophisticated and the childlike. He died in very peculiar circumstances. For some peculiar reason, she refused to come inside. The peculiar thing was that no one mentioned her disappearance. They behaved in a very peculiar way.
- 2peculiar (to somebody/something) belonging or relating to one particular place, situation, person, etc., and not to others a humor that is peculiar to American sitcoms a species of bird peculiar to Asia He has his own peculiar style, which you'll soon get used to. the family's peculiar importance in the affair the peculiar properties of mercury