| awake(adjective, understanding, cool, reasonable, keen) |
| chary(adjective, reasonable, sensible, deliberate, restrained) |
| on the ball(expression, adjective, idiom, sharp, bright) |
| wide-awake(adjective, sharp, bright, lively, alert) |
| jealous(adjective, wary) |
| keen(adjective, understanding, sensible, certain, alert) |
| provident(adjective, sensible, careful, thoughtful, sober) |
| on the alert(expression, adjective, idiom, care, alert) |
| protective(adjective, careful, thoughtful, sober, attentive) |
| ready(adjective, sharp, bright, excited, lively) |
| sleepless(adjective, alert, careful, restless, disturbed) |
| conscientious(adjective, deliberate, alert, careful, caring) |
| conscious(adjective, understanding, cool, keen, sensible) |
| discreet(adjective, sensible, restrained, careful, thoughtful) |
| intent(adjective, feature, characteristic, complete, detail) |
| nimble(adjective, smart, dexterous) |
| prepared(adjective, excited, ready, anxious, alert) |
| acute(adjective, alert, careful, perceptive, attentive) |
| agog(adjective, alert, careful, attentive, watchful) |
| argus-eyed |