Synonyms and related words :
OK, acceptable, admissible, agreeable, all right, alright, arguable, believable, colorable, conceivable, condonable, credible, creditable, defendable, defensible, excusable, fiduciary, good enough, imaginable, impregnable, justifiable, maintainable, okay, passable, plausible, possible, rational, reasonable, reliable, secure, supportable, trustworthy, trusty, unexceptionable, unimpeachable, unobjectionable, unquestionable, viable, vindicable, warrantable, workable, worthy of faith