| Solution | Length | |
|---|---|---|
| 2 letters | ||
| UP | 2 | |
| 4 letters | ||
| keen | 4 | |
| tern | 4 | |
| 5 letters | ||
| smart | 5 | |
| agile | 5 | |
| sharp | 5 | |
| alive | 5 | |
| alert | 5 | |
| ready | 5 | |
| aware | 5 | |
| quick | 5 | |
| awake | 5 | |
| 6 letters | ||
| nimble | 6 | |
| astute | 6 | |
| on the | 6 | |
| prompt | 6 | |
| bright | 6 | |
| 7 letters | ||
| wakeful | 7 | |
| 8 letters | ||
| openeyed | 8 | |
| vigilant | 8 | |
| WATCHFUL | 8 | |
| sensible | 8 | |
| qui vive | 8 | |
| 9 letters | ||
| conscious | 9 | |
| ATTENTIVE | 9 | |
| OPEN EYED | 9 | |
| sleepless | 9 | |
| unnodding | 9 | |
| unwinking | 9 | |
| 10 letters | ||
| unblinking | 10 | |
| on the job | 10 | |
| unsleeping | 10 | |
| unskillful | 10 | |
| RESPONSIVE | 10 | |
| 11 letters | ||
| clearheaded | 11 | |
| on the ball | 11 | |
| 12 letters | ||
| clear witted | 12 | |
| On the alert | 12 | |
| 13 letters | ||
| freshasadaisy | 13 | |
| clear-sighted | 13 | |