| hooked(adjective, ready, alert, careful, cautious) |
| keen(adjective, alert, careful, cautious, attentive) |
| not missing a trick(expression, adjective, idiom, ready, alert) |
| on the alert(expression, idiom, alert, attentive, observant) |
| on the ball(expression, adjective, idiom, alert, careful) |
| on the job(expression, adjective, idiom, alert, careful) |
| on the qui vive(expression, adjective, idiom, alert, careful) |
| prepared(adjective, ready, alert, careful, cautious) |
| prudent |
| rapt |
| ready(adjective, alert, careful, cautious, attentive) |
| see after(expression, adjective, ready, alert, careful) |
| see to(expression, adjective, ready, alert, careful) |
| sharp-eyed |
| sleepless |
| suspicious(adjective, alert, careful, cautious, attentive) |
| unsleeping(adjective, alert, careful, cautious, attentive) |
| wakeful(adjective, alert, careful, cautious, attentive) |
| wide-awake(adjective, alert, careful, cautious, attentive) |
| with eyes peeled(expression, adjective, idiom, ready, alert) |