| know all the answers(expression, adjective, idiom, careful, aware) |
| know ins and outs(expression, adjective, idiom, careful, aware) |
| know the score(expression, adjective, idiom, alert, familiar) |
| knowledgeable about |
| known(adjective, understanding, keen, sensible, certain) |
| laid-back(adjective, refined, practical, cultured, urbane) |
| latched on(expression, adjective, alert, familiar, wise) |
| let into |
| mature(adjective, refined, practical, cultured, classy) |
| mindful of |
| mondaine(adjective, cool, refined, practical, mature) |
| nagging |
| noticing(adjective, understanding, keen, sensible, certain) |
| noting(adjective, understanding, keen, sensible, certain) |
| observant(adjective, understanding, cool, sensible, familiar) |
| observative(adjective, careful, knowledgeable, cautious, aware) |
| on onto |
| on the ball(expression, adjective, idiom, careful, aware) |
| on the job(expression, adjective, idiom, careful, aware) |
| perceiving(adjective, understanding, keen, sensible, certain) |