| Solution | Length | |
|---|---|---|
| 4 letters | ||
| mute | 4 | |
| snug | 4 | |
| 5 letters | ||
| quiet | 5 | |
| short | 5 | |
| terse | 5 | |
| still | 5 | |
| close | 5 | |
| stern | 5 | |
| tight | 5 | |
| 6 letters | ||
| solemn | 6 | |
| pruned | 6 | |
| silent | 6 | |
| 7 letters | ||
| summary | 7 | |
| spartan | 7 | |
| 8 letters | ||
| reserved | 8 | |
| wordless | 8 | |
| straight | 8 | |
| succinct | 8 | |
| reticent | 8 | |
| 9 letters | ||
| shortened | 9 | |
| secretive | 9 | |
| saturnine | 9 | |
| truncated | 9 | |
| 10 letters | ||
| speechless | 10 | |
| 11 letters | ||
| tightlipped | 11 | |
| untalkative | 11 | |
| sententious | 11 | |
| tongue-tied | 11 | |
| 12 letters | ||
| pauciloquous | 12 | |
| to the point | 12 | |
| tight-lipped | 12 | |
| 13 letters | ||
| inconversible | 13 | |
| 15 letters | ||
| UNCOMMUNICATIVE | 15 | |