| judicious(adjective, sound, sensible, ready, knowledgeable) |
| kept posted(expression, adjective, familiar, knowledgeable, skilled) |
| know stuff(expression, expert, skilled, capable, skillful) |
| knowing the score(expression, idiom, familiar, knowledgeable, skilled) |
| literary(adjective, familiar, knowledgeable, informed, experienced) |
| long-serving(skilled, experienced, seasoned, old-time) |
| long-time(skilled, experienced, seasoned, old-time) |
| mature(ready, familiar, tired, knowledgeable, skilled) |
| matured(ready, familiar, tired, knowledgeable, qualified) |
| measured(noun, verb) |
| no dummy(expression, expert, skilled, capable, skillful) |
| no slouch(expression, expert, skilled, capable, skillful) |
| not born yesterday(expression, idiom, skilled, experienced, seasoned) |
| not young(expression, tired, gray, mature, aged) |
| observant(adjective, cool, sensible, familiar, knowledgeable) |
| of the old school(expression, idiom, skilled, experienced, seasoned) |
| old-time(skilled, experienced, seasoned) |
| old hand(expression, familiar, knowledgeable, skilled, qualified) |
| olden(tired, gray, mature, aged, older) |
| oldish(tired, gray, mature, aged, older) |