Synonyms of infallible
- 1 Syllable
- sure, true
- 2 Syllables
- correct, handy, sure-fire, come-through, certain, faultless, foolproof, helpful, exact, perfect, flawless, fleckless
- 3 Syllables
- reliable, failsafe, satisfying, inerrant, returnless, watertight, efficient, trustworthy, unfailing, unerring, effectual, agreeable, omniscient, useful
- 4 Syllables
- surefire, acceptable, efficacious, unrefuted, accurate, impeccable, inerrable, inarguable, apodictic, positive, effective, unbeatable
- 5 Syllables
- undisputable, satisfactory, undeceivable, unimpeachable, incontestable, establishable, inevasible, unescapable, unassailable, unquestionable
- 6 Syllables
- authoritative, incontrovertible