| understanding(adjective, keen, sensible, certain, alert) |
| undivided(adjective, whole) |
| waking(careful, restless, disturbed, conscious, sleepless) |
| well-prepared(careful, wise, tight, shrewd, prudent) |
| with it(expression, understanding, keen, sharp, bright) |
| apperceptive(adjective, understanding, keen, sensible, certain) |
| apprised(adjective, understanding, keen, sensible, certain) |
| armed |
| armed and ready(expression, idiom) |
| assured(adjective, understanding, keen, sensible, certain) |
| astute(adjective, understanding, cool, significant, intelligent) |
| au courant(expression, adjective, understanding, keen, sensible) |
| aux aguets |
| avid |
| be up on(adjective, careful, cautious, aware, attentive) |
| brainy(adjective, understanding, cool, significant, intelligent) |
| briefed |
| brilliant(adjective, cool, alert, significant, intelligent) |
| broad awake(expression, idiom, care) |
| calculating(restrained, careful, reserved, cautious, prudent) |