| dynamite(adjective, familiar, sophisticated, knowledgeable, skilled) |
| erudite(adjective, familiar, refined, knowledgeable, aware) |
| esoteric(adjective, sound, knowledgeable, cultured, educated) |
| expert(adjective, familiar, knowledgeable, qualified, cultured) |
| farsighted(adjective, smooth, keen, sharp, smart) |
| foxy(adjective, smooth, keen, sharp, smart) |
| go-go(adjective, alert, familiar, wise, knowledgeable) |
| grave(adjective, sound, knowledgeable, cultured, educated) |
| groovy(adjective, cool, alert, familiar, wise) |
| having something on the ball(expression, adjective, idiom, sophisticated, knowledgeable) |
| heady(adjective, smooth, keen, sharp, smart) |
| highbrow(adjective, knowledgeable, intellectual, cultured, learned) |
| hip to(expression, adjective, cool, sensible, familiar) |
| in on(expression, adjective, cool, sensible, familiar) |
| in the secret(expression, idiom) |
| in to(expression, adjective, familiar, wise, knowledgeable) |
| in touch(expression, informed) |
| informed of |
| ingenious(adjective, smooth, keen, sharp, smart) |
| inside(adjective, sharp, smart, intelligent, prudent) |