Synonyms to fail-safe

dependable, calculable, faithful, faithworthy, fast, firm, guaranteed, harmless, incorruptible, invincible, inviolable, invulnerable, predictable, proven, reliable, responsible, riskless, secure, solid, sound, stable, staunch, steadfast, steady, straight, substantial, sure, surefire, tested, to be trusted, tried, tried and true, true, trustable, trustworthy, trusty, undangerous, unfailing, unfalse, unhazardous, unperfidious, unperilous, unprecarious, unrisky, untreacherous, warranteed, well-founded, well-grounded, Aktiengesellschaft, CIA, Central Intelligence Agency, Christian, abiding, accepted, adamant, adamantine, agency, airtight, aktiebolag, anchored, anneal, approved, at a standstill, atelier, authentic, authoritative, balance, balanced, ballast, barbershop, beauty parlor, beauty shop, bench, body corporate, bonded, bristling, bulky, business, business establishment, butcher shop, calcify, callous, canonical, cartel, case harden, cast-iron, cemented, certain, chamber of commerce, changeless, close, close-knit, close-textured, close-woven, combine, commercial enterprise, c