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u·nique

adjective

1.

being the only one of its kind; unlike anything else.

synonyms:distinctive, distinct, individual, special, single, sole, lone, unrepeated, unrepeatable, solitary, exclusive, rare, uncommon, unusual

informalone-off, one-of-a-kind, once-in-a-lifetime, one-shot
synonyms:remarkable, special, singular, exceptional, noteworthy, notable, extraordinary

formal unexampled
belonging or connected to (one particular person, group, or place).
synonyms:peculiar, specific, limited