| acquainted(adjective, understanding, knowledge, keen, sensible) |
| apprised(adjective, understanding, knowledge, keen, sensible) |
| sentient(adjective, understanding, open, cool, reasonable) |
| careful(adjective, kind, sound, keen, sharp) |
| intelligent(adjective, understanding, cool, sound, reasonable) |
| witting(adjective, understanding, cool, reasonable, knowledge) |
| astute(adjective, understanding, cool, kind, sound) |
| hip(adjective, knowledge, slang, informal, alert) |
| appreciative(adjective, understanding, enthusiastic, sympathetic, alert) |
| cautious(adjective, kind, keen, friendly, delicate) |
| cognisant(adjective, mental condition) |
| familiar(adjective, cool, sensible, alert, knowledgeable) |
| open-eyed(adjective, feature, characteristic, keen, detail) |
| regardful(adjective, feature, characteristic, kind, friendly) |
| sharp(adjective, understanding, open, cool, sound) |
| au courant(expression, adjective, idiom, understanding, cool) |
| conversant(adjective, understanding, cool, reasonable, keen) |
| apprehensive(adjective, cool, knowledge, sensible, alert) |
| keen(adjective, understanding, sharp, smart, sensible) |
| perspicacious(adjective, understanding, keen, sensible, perceptive) |