| alert(adjective, sharp, bright, lively, aware) |
| on the ball(expression, adjective, idiom, sharp, lively) |
| active(sharp, bright, lively, alert, aware) |
| all ears(expression, sharp, bright, lively, active) |
| attentive(sharp, lively, alert, aware, clued-in) |
| bright(sharp, lively, active, alert, aware) |
| cagey(sharp, bright, lively, active, careful) |
| careful(sharp, bright, lively, alert, wise) |
| circumspect(sharp, bright, lively, alert, careful) |
| fast on the draw(expression, idiom, sharp, bright, lively) |
| heads up(expression, sharp, bright, lively, active) |
| heedful(sharp, bright, lively, active, careful) |
| hip(sharp, bright, lively, active, careful) |
| jazzed(sharp, bright, lively, active, careful) |
| lively(sharp, bright, active, alert, aware) |
| observant(sharp, bright, lively, alert, careful) |
| on guard(expression, sharp, bright, lively, alert) |
| on the job(expression, idiom, sharp, bright, lively) |
| on the lookout(expression, idiom, sharp, bright, lively) |
| on the qui vive(expression, idiom, sharp, bright, lively) |