adj. 25B6; adjective INFERIOR, second-rate, low-quality, poor, below par, imperfect, faulty, defective, shoddy, shabby, unsound, unsatisfactory; informal tenth-rate, crummy, lousy; Brit. informal duff, ropy, rubbish, chronic.
SUBSTANDARD
Meaning of SUBSTANDARD in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012