- (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 21, 2026, from http://smartdefine.org/infallible/definitions/2021291 |
| Chicago | Webster's. 2011. "Infallible" http://smartdefine.org/infallible/definitions/2021291 (accessed September 21, 2026). |
| Harvard | Webster's 2011, Infallible, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/infallible/definitions/2021291>. |
| MLA | Webster's. "Infallible" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/infallible/definitions/2021291> |