| Rating | Solver | Clue |
|---|---|---|
| PLEDGE | Solemn promise | |
| IDO | Solemn promise | |
| VOW | Solemn promise | |
| OATH | Solemn promise | |
| HIPPOCRATICOATH | A solemn promise made by doctors | |
| SOLEMN | Fitted to awaken or express serious reflections; marked by seriousness; serious; grave; devout; as, a solemn promise; solemn earnestness. | |
| SWEAR | To utter or affirm with a solemn appeal to God for the truth of the declaration; to make (a promise, threat, or resolve) under oath. | |