| thoughtful(adjective, kind, sound, sharp, smart) |
| acute(adjective, understanding, keen, sharp, smart) |
| hep(adjective, familiar, knowledgeable, skilled, experienced) |
| on the ball(expression, adjective, idiom, keen, careful) |
| on the lookout(expression, adjective, idiom, keen, careful) |
| paying attention |
| posted(adjective, familiar, informed, well-informed) |
| skillful(adjective, cool, knowledge, experience, delicate) |
| streetwise |
| tactful(adjective, kind, friendly, sensible, delicate) |
| up on(expression, adjective, cool, sensible, alert) |
| versed(adjective, cool, sensible, familiar, knowledgeable) |
| ware |
| agog(keen, alert, careful, attentive, watchful) |
| alive to(verb, expression, adjective, phrasal verb, understanding) |
| briefed(informed, well-informed) |
| cognizant of(verb, expression, adjective, phrasal verb, knowledge) |
| cool(adjective, reasonable, sensible, informal, alert) |
| deliberate(adjective, cool, kind, friendly, significant) |
| diplomatic(adjective, kind, friendly, appropriate, delicate) |