| aware(keen, alert, careful, attentive, watchful) |
| cautious(keen, alert, careful, attentive, watchful) |
| circumspect(keen, alert, careful, attentive, watchful) |
| guarded(keen, anxious, alert, careful, cautious) |
| keen(anxious, alert, careful, cautious, attentive) |
| looking for(expression, keen, anxious, alert, careful) |
| looking to(expression, keen, anxious, alert, careful) |
| observant(keen, alert, careful, attentive, watchful) |
| on guard(expression, keen, anxious, alert, careful) |
| on the ball(expression, keen, alert, careful, attentive) |
| on the job(expression, idiom, keen, alert, careful) |
| on the lookout(expression, idiom, keen, alert, careful) |
| on the qui vive(expression, idiom, keen, alert, careful) |
| on toes(expression, keen, anxious, alert, careful) |
| open-eyed(keen, anxious, alert, careful, cautious) |
| sharp(keen, anxious, alert, careful, attentive) |
| sleepless(keen, anxious, alert, careful, cautious) |
| unsleeping(keen, anxious, alert, careful, cautious) |
| vigilant(adjective, alert, careful, attentive, watchful) |
| waiting on(expression, keen, anxious, alert, careful) |