| introduced(adjective, familiar, knowledgeable, aware, savvy) |
| judicious(adjective, understanding, reasonable, sensible, rational) |
| just out(expression, adjective, present, unusual, strange) |
| keen(adjective, understanding, sensible, certain, alert) |
| keep up |
| kept posted(expression, adjective, familiar, knowledgeable, skilled) |
| know-how(adjective, alert, familiar, wise, knowledgeable) |
| know all the answers(expression, idiom, careful, aware, attentive) |
| know ins and outs(expression, idiom, careful, aware, attentive) |
| know the score(expression, idiom, alert, familiar, wise) |
| known(adjective, understanding, keen, sensible, certain) |
| latched on(expression, alert, familiar, wise, knowledgeable) |
| late(adjective, unusual, strange, fresh, original) |
| leading-edge(present, new, current, modern, contemporary) |
| learned(adjective, familiar, refined, knowledgeable, skilled) |
| lettered(adjective, familiar, polite, sophisticated, refined) |
| modernistic(adjective, unusual, strange, new, fresh) |
| modish(adjective, unusual, strange, new, fresh) |
| most recent(expression, adjective, advanced, up-to-the-minute, brand-new) |
| neoteric(adjective, unusual, strange, new, fresh) |