Synonyms and related words :
accurate, authoritative, believable, calculable, colorable, conceivable, convincing, credible, dependable, ethical, exact, fail-safe, faithful, faithworthy, fast, fiduciary, firm, guaranteed, harmless, honest, honorable, incorruptible, invincible, inviolable, invulnerable, loyal, moral, plausible, predictable, principled, proven, realistic, reliable, responsible, riskless, scrupulous, secure, solid, sound, stable, staunch, steadfast, steady, straight, substantial, sure, surefire, tenable, tested, to be trusted, tried, tried and true, TRUE, trustable, trusty, truthful, undangerous, unexceptionable, unfailing, unfalse, unhazardous, unimpeachable, unperfidious, unperilous, unprecarious, unquestionable, unrisky, untreacherous, upright, valid, veracious, warranteed, well-founded, well-grounded, worthy of faith