| Solution | Length | |
|---|---|---|
| 3 letters | ||
| set | 3 | |
| 4 letters | ||
| spec | 4 | |
| sure | 4 | |
| 5 letters | ||
| sound | 5 | |
| sworn | 5 | |
| 6 letters | ||
| tested | 6 | |
| secure | 6 | |
| steady | 6 | |
| stated | 6 | |
| stable | 6 | |
| proved | 6 | |
| 7 letters | ||
| settled | 7 | |
| assured | 7 | |
| certain | 7 | |
| ensured | 7 | |
| 8 letters | ||
| RISKFREE | 8 | |
| LOCKEDIN | 8 | |
| failsafe | 8 | |
| CANTMISS | 8 | |
| CANTLOSE | 8 | |
| reliable | 8 | |
| promised | 8 | |
| surefire | 8 | |
| FOR SURE | 8 | |
| 9 letters | ||
| foolproof | 9 | |
| warranted | 9 | |
| 10 letters | ||
| idiotproof | 10 | |
| 11 letters | ||
| trustworthy | 11 | |