| Rating | Solver | Clue |
|---|---|---|
| UNERRING | Infallible | |
| FOOLPROOF | Infallible | |
| UNFAILABLE | Infallible. | |
| UNFALLIBLE | Infallible. | |
| ORACLE | Infallible authority | |
| CERTAIN | Unfailing; infallible. | |
| INERRABLE | Incapable of erring; infallible; unerring. | |
| INFALLIBLY | In an infallible manner; certainly; unfailingly; unerringly. | |
| INFALLIBLENESS | The state or quality of being infallible; infallibility. | |
| INFALLIBILITY | The quality or state of being infallible, or exempt from error; inerrability. | |
| INFALLIBLE | Not liable to fail, deceive, or disappoint; indubitable; sure; certain; as, infallible evidence; infallible success; an infallible remedy. | |