| jaded(refined, practical, cultured, urbane, erudite) |
| jet-set(adjective, cool, refined, practical, mature) |
| judicious(adjective, understanding, keen, sharp, sensible) |
| keen(adjective, understanding, sharp, sensible, certain) |
| know-how(adjective, alert, familiar, wise, knowledgeable) |
| known(adjective, understanding, keen, sensible, certain) |
| laid-back(refined, practical, cultured, urbane, erudite) |
| latched on(expression, adjective, alert, familiar, wise) |
| learned(knowledgeable, witting, aware, informed, well-informed) |
| let into |
| mature(adjective, refined, practical, cultured, classy) |
| mindful of |
| mondaine(adjective, cool, refined, practical, mature) |
| noticing(adjective, understanding, keen, sensible, certain) |
| noting(adjective, understanding, keen, sensible, certain) |
| observant(adjective, understanding, cool, keen, sharp) |
| observing(adjective, understanding, keen, sensible, certain) |
| on top of(expression, idiom, knowledgeable, informed, learned) |
| penetrative(understanding, keen, alert, sensitive, perceptive) |
| perceiving(adjective, understanding, keen, sensible, certain) |