| know-how(adjective, alert, familiar, wise, knowledgeable) |
| know backwards and forwards(expression, keen, smart, intelligent, competent) |
| know the ropes(expression, keen, smart, intelligent, competent) |
| know the score(expression, idiom, alert, familiar, wise) |
| known(adjective, understanding, keen, sensible, certain) |
| laid-back(refined, practical, cultured, urbane, erudite) |
| last word(expression, adjective, smart, new, hot) |
| latched on(expression, alert, familiar, wise, knowledgeable) |
| latest thing(expression, adjective, smart, new, hot) |
| leading-edge(present, new, current, modern, contemporary) |
| learned(keen, smart, intelligent, competent, aware) |
| lively(sharp, bright, active, alert, aware) |
| masterful(keen, smart, intelligent, competent, capable) |
| masterly(keen, smart, intelligent, skilled, competent) |
| mature(adjective, refined, practical, cultured, classy) |
| minute |
| mondaine(adjective, cool, refined, practical, mature) |
| natty(adjective, fine, smart, new, hot) |
| no stranger to(expression, adjective, idiom, familiar, knowledgeable) |
| noticing(adjective, understanding, keen, sensible, certain) |