| wise to(expression, adjective, understanding, keen, sensible) |
| able to recognize(expression, adjective, idiom, understanding, keen) |
| acquainted(adjective, understanding, keen, sensible, certain) |
| aesthetic(adjective, understanding, keen, sensible, certain) |
| alert(adjective, understanding, keen, sensible, certain) |
| apperceptive(adjective, understanding, keen, sensible, certain) |
| appreciative |
| appreciative of |
| apprehensive(adjective, careful, knowledgeable, cautious, aware) |
| apprised(adjective, understanding, keen, sensible, certain) |
| apprised of |
| assured(adjective, understanding, keen, sensible, certain) |
| attentive(adjective, understanding, keen, sensible, certain) |
| au courant(expression, adjective, understanding, keen, sensible) |
| awake(adjective, understanding, keen, sensible, certain) |
| awake to |
| be up on(adjective, careful, knowledgeable, cautious, aware) |
| behind the curtain(expression, idiom) |
| behind the scenes(expression, idiom) |
| breathless |