one of a kind
With no equal; completely unique. This is a one of a kind opportunity—you have to take it! This design is one of a kind, as the artist only ever made one. Not many people have so much talent at such a young age. This kid is truly one of a kind.
one of a kind
see under of a kind.
one of a ˈkind
the only one like this: My father was one of a kind — I’ll never be like him.