FROWSTY Meaning of FROWSTY in English ■ adjective ( frowstier , frowstiest ) Brit. having a stale, warm, and stuffy atmosphere.Derivativesfrowstiness noun OriginC19 (orig. dialect): var. of frowzy . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004