| Solution | Length | |
|---|---|---|
| 3 letters | ||
| sly | 3 | |
| 4 letters | ||
| tail | 4 | |
| wily | 4 | |
| cagy | 4 | |
| 5 letters | ||
| stalk | 5 | |
| sharp | 5 | |
| privy | 5 | |
| quiet | 5 | |
| sneak | 5 | |
| 6 letters | ||
| shifty | 6 | |
| shadow | 6 | |
| sneaky | 6 | |
| slinky | 6 | |
| secret | 6 | |
| hidden | 6 | |
| tricky | 6 | |
| 7 letters | ||
| secrecy | 7 | |
| private | 7 | |
| hangdog | 7 | |
| 8 letters | ||
| SKULKING | 8 | |
| sub rosa | 8 | |
| onthesly | 8 | |
| sinister | 8 | |
| slippery | 8 | |
| sneaking | 8 | |
| stealing | 8 | |
| backdoor | 8 | |
| weaselly | 8 | |
| scheming | 8 | |
| stealthy | 8 | |
| 9 letters | ||
| two-faced | 9 | |
| concealed | 9 | |
| BACKSTAIR | 9 | |
| underhand | 9 | |
| secretive | 9 | |
| DISGUISED | 9 | |
| 10 letters | ||
| UNDERNEATH | 10 | |
| undercover | 10 | |
| 11 letters | ||
| SECRETIVELY | 11 | |
| clandestine | 11 | |
| unobtrusive | 11 | |
| treacherous | 11 | |
| underhanded | 11 | |
| underground | 11 | |
| 13 letters | ||
| surreptitious | 13 | |