| down with(expression, adjective, sensible, knowledgeable, witting) |
| ear to the ground(expression, idiom, understanding, keen, sensitive) |
| enlightened(adjective, alert, familiar, wise, knowledgeable) |
| erudite(knowledgeable, aware, informed, cultured, learned) |
| experienced(adjective, refined, practical, mature, cultured) |
| expert(knowledgeable, aware, informed, learned, well-informed) |
| felt(adjective, understanding, keen, sensible, certain) |
| gnostic(understanding, keen, alert, sensitive, penetrating) |
| go-go(adjective, alert, familiar, wise, knowledgeable) |
| groovy(adjective, cool, alert, familiar, wise) |
| heedful(adjective, alert, familiar, wise, knowledgeable) |
| hep |
| hip(adjective, alert, familiar, wise, knowledgeable) |
| hip to(expression, adjective, cool, sensible, familiar) |
| in right mind(expression, adjective, idiom, understanding, keen) |
| in the secret(expression, idiom) |
| in to(expression, adjective, familiar, wise, knowledgeable) |
| incisive(understanding, keen, alert, sensitive, penetrating) |
| insighted(understanding, keen, alert, sensitive, penetrating) |
| intuitive(understanding, keen, alert, sensitive, perceptive) |