SONSY Meaning of SONSY in English adj. (also sonsie) (sonsier, sonsiest) Sc. 1 plump, buxom. 2 of a cheerful disposition. 3 bringing good fortune. [ ult. f. Ir. & Gael. sonas good fortune f. sona fortunate ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012