| active(adjective, sharp, lively, attentive, occupied) |
| assiduous(considerate, responsive, helpful) |
| at it(expression, adjective, active, busy, occupied) |
| at work(expression, adjective, active, busy, occupied) |
| awake(adjective, adverb, sharp, considerate, aware) |
| bright(adjective, sharp, lively, alert, aware) |
| cagey(adjective, sharp, bright, lively, alert) |
| circumspect(adjective, keen, sharp, bright, lively) |
| conscious(adjective, careful, knowledgeable, cautious, aware) |
| engaged(adjective, active, busy, occupied, running) |
| in harness(expression, adjective, active, busy, occupied) |
| intent(adjective, considerate, responsive, aware, helpful) |
| keen(adjective, anxious, alert, careful, cautious) |
| observing(adjective, careful, knowledgeable, cautious, aware) |
| occupied(adjective, active, busy, running, working) |
| on guard(expression, adjective, keen, sharp, bright) |
| on the lookout(expression, adjective, idiom, sharp, lively) |
| on the qui vive(expression, adjective, idiom, keen, sharp) |
| quick(adjective, sharp, bright, lively, alert) |
| regardful(adjective, careful, caring, thoughtful, knowledgeable) |