These are other word, synonyms and antonyms of unique : special, rare, exceptional, unparalleled, unmatched, one-of-a-kind, singular, exclusive, distinctive ... Some common synonyms of unique are eccentric, erratic, odd, outlandish, peculiar, quaint, singular, and strange. While all these words mean "departing from what is ordinary, usual, or to be expected," unique implies singularity and the fact of being without a known parallel. UNIQUE - Synonyms , related words and examples | Cambridge English Thesaurus Similar words for Unique . Definition: adjective. ['juːˈniːk'] radically distinctive and without equal.