| switched on(expression, adjective, cool, familiar, refined) |
| tuned in(expression, adjective, understanding, cool, keen) |
| up on(expression, adjective, cool, sensible, alert) |
| wised up(expression, adjective, alert, familiar, wise) |
| with it(expression, adjective, understanding, cool, keen) |
| able to recognize(expression, adjective, idiom, understanding, keen) |
| acute(understanding, keen, sensitive, perceptive, penetrating) |
| adult(adjective, cool, refined, practical, mature) |
| aesthetic(adjective, understanding, keen, sensible, certain) |
| alive(adjective, cool, sensible, alert, familiar) |
| apperceptive(adjective, understanding, keen, sensible, certain) |
| appraised(adjective, alert, familiar, wise, knowledgeable) |
| appreciative of |
| apprised of |
| apprized(knowledgeable, aware, informed, learned, well-informed) |
| artificial(adjective, cool, refined, practical, cultured) |
| assured(adjective, understanding, keen, sensible, certain) |
| awake to |
| been around(expression, adjective, refined, practical, mature) |
| behind the curtain(expression, idiom) |