| watchful(adjective, adverb, keen, sharp, lively) |
| vigilant(adjective, adverb, sharp, bright, lively) |
| alert(adjective, adverb, keen, sharp, bright) |
| wary(adjective, adverb, keen, sharp, bright) |
| cautious(adjective, adverb, keen, alert, careful) |
| observant(adjective, adverb, keen, sharp, bright) |
| careful(adjective, adverb, keen, sharp, bright) |
| heedful(adjective, adverb, sharp, bright, lively) |
| circumspect(adjective, keen, sharp, bright, lively) |
| on the lookout(expression, adjective, idiom, adverb, sharp) |
| awake(adjective, alert, careful, restless, disturbed) |
| guarded(adjective, adverb, keen, anxious, alert) |
| attentive(adjective, keen, sharp, bright, lively) |
| on one's guard(adjective, adverb, wary) |
| gingerly(adjective, cautious, suspicious, watchful) |
| mindful(adjective, adverb, wary) |
| on the watch(expression, adjective, idiom, adverb, alert) |
| prudent(adjective, cautious, suspicious, watchful) |
| safe(adjective, cautious, suspicious, watchful) |
| all ears(expression, adjective, sharp, bright, lively) |