| heady(sharp, smart, intelligent, clever, astute) |
| heedful(adjective, alert, familiar, wise, knowledgeable) |
| hip(adjective, alert, familiar, wise, knowledgeable) |
| in the picture(expression, adjective, idiom, alert, familiar) |
| in to(expression, adjective, smart, familiar, wise) |
| informed(adjective, alert, familiar, rational, wise) |
| ingenious(sharp, smart, intelligent, clever, astute) |
| inside(sharp, smart, intelligent, clever, astute) |
| jaded(refined, practical, cultured, urbane, erudite) |
| jet-set(adjective, cool, refined, practical, mature) |
| judicious(sharp, smart, intelligent, clever, astute) |
| keen(sharp, smart, intelligent, clever, skillful) |
| know-how(adjective, alert, familiar, wise, knowledgeable) |
| know the score(expression, adjective, idiom, alert, familiar) |
| knowledgeable(adjective, alert, familiar, rational, wise) |
| laid-back(refined, practical, cultured, urbane, erudite) |
| latched on(expression, adjective, alert, familiar, wise) |
| learned(adjective, smooth, reasonable, smart, rational) |
| mature(adjective, refined, practical, cultured, classy) |
| mindful(adjective, alert, familiar, wise, knowledgeable) |