| animated |
| appercipient |
| appraised(adjective, alert, familiar, wise, knowledgeable) |
| appreciate |
| apprehending |
| arguable(adjective, sound, sensible, rational, intelligent) |
| assiduous |
| at home with(expression, adjective, idiom, familiar, knowledgeable) |
| au fait(expression, adjective, familiar, knowledgeable, skilled) |
| aware of(verb, expression, phrasal verb, knowledge, wise) |
| be up on(careful, knowledgeable, cautious, aware, attentive) |
| believable(adjective, sound, sensible, rational, intelligent) |
| brainy(adjective, understanding, cool, keen, sharp) |
| bright(adjective, cool, crack, significant, familiar) |
| brilliant(adjective, cool, crack, significant, familiar) |
| cagey(careful, cautious, aware, attentive, wary) |
| canny(adjective, cool, reasonable, significant, rational) |
| capable of life(expression, idiom) |
| certified(notorious, recognized, identified) |
| chary(adjective, modest, humble, careful, knowledgeable) |