| Solution | Length | |
|---|---|---|
| 3 letters | ||
| ira | 3 | |
| sly | 3 | |
| nsa | 3 | |
| fbi | 3 | |
| cia | 3 | |
| 4 letters | ||
| clam | 4 | |
| 5 letters | ||
| cagey | 5 | |
| close | 5 | |
| 6 letters | ||
| THECIA | 6 | |
| covert | 6 | |
| watery | 6 | |
| rheumy | 6 | |
| shifty | 6 | |
| serous | 6 | |
| sneaky | 6 | |
| secret | 6 | |
| coypus | 6 | |
| silent | 6 | |
| 7 letters | ||
| seminal | 7 | |
| private | 7 | |
| 8 letters | ||
| salivary | 8 | |
| watering | 8 | |
| stealthy | 8 | |
| hushhush | 8 | |
| 9 letters | ||
| spermatic | 9 | |
| secretory | 9 | |
| 10 letters | ||
| UNSOCIABLE | 10 | |
| swissbanks | 10 | |
| 13 letters | ||
| surreptitious | 13 | |
| hugger-mugger | 13 | |
| 15 letters | ||
| UNCOMMUNICATIVE | 15 | |