25B6; adjective JUSTIFIABLE, justified, warranted, legitimate, defensible, valid, admissible, allowable, understandable, excusable, acceptable, reasonable, sensible, sound.
groundless.
WELL FOUNDED
Meaning of WELL FOUNDED in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012