- (a.) Not liable to fail, deceive or disappoint; indubitable; sure; certain; as, infallible evidence; infallible success; an infallible remedy.
- (a.) Incapable of error in defining doctrines touching faith or morals. See Papal infallibility, under Infallibility.
- (a.) Not fallible; not capable of erring; entirely exempt from liability to mistake; unerring; inerrable.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). infallible. Retrieved September 22, 2026, from http://smartdefine.org/infallible/definitions/2021291 |
| Chicago | Webster's. 2011. "infallible" http://smartdefine.org/infallible/definitions/2021291 (accessed September 22, 2026). |
| Harvard | Webster's 2011, infallible, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/infallible/definitions/2021291>. |
| MLA | Webster's. "infallible" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/infallible/definitions/2021291> |