| fussy(adjective, careful, thoughtful, sober, attentive) |
| judicious(adjective, understanding, cool, reasonable, sensible) |
| prompt(adjective, responsive, early) |
| scrupulous(adjective, complete, careful, sober, whole) |
| sharp-eyed(adjective, alert, intelligent, attentive, watchful) |
| thoughtful(adjective, reasonable, sensible, deliberate, restrained) |
| unsleeping(adjective, alert, careful, cautious, disturbed) |
| wide awake(expression, adjective, idiom, sharp, bright) |
| active(adjective, sharp, bright, lively, alert) |
| alive(adjective, cool, alert, significant, intelligent) |
| diligent(adjective, attentive) |
| eagle-eyed(adjective, alert, intelligent, attentive, watchful) |
| observing(adjective, understanding, keen, sensible, certain) |
| shrewd(adjective, sensible, careful, wise, tight) |
| thorough(adjective, complete, thoughtful, sober, whole) |
| wise(adjective, understanding, cool, reasonable, sharp) |
| absorbed(adjective, attentive) |
| all ears(expression, adjective, sharp, bright, lively) |
| brisk |
| cagey(adjective, sharp, bright, sensible, lively) |