Meaning of SINGULAR in English

SINGULAR

n. 25B6; adjective

the gallery's singular capacity to attract sponsors : REMARKABLE, extraordinary, exceptional, outstanding, signal, notable, noteworthy; rare, unique, unparalleled, unprecedented, amazing, astonishing, phenomenal, astounding; informal fantastic, terrific.

why was Betty was behaving in so singular a fashion? : STRANGE, unusual, odd, peculiar, funny, curious, extraordinary, bizarre, eccentric, weird, queer, unexpected, unfamiliar, abnormal, atypical, unconventional, out of the ordinary, untypical, puzzling, mysterious, perplexing, baffling, unaccountable.

Concise Oxford thesaurus English vocabulary.      Краткий оксфордский словарь английского языка тезаурус.