| observing(adjective, understanding, kind, keen, sensible) |
| apprehensive(adjective, kind, deliberate, alert, familiar) |
| awake(adjective, understanding, keen, sensible, certain) |
| guarded(adjective, alert, careful, thoughtful, sober) |
| perceptive(adjective, understanding, enthusiastic, alert, familiar) |
| au courant(expression, adjective, understanding, keen, sensible) |
| intent(adjective, considerate, responsive, aware, attentive) |
| knowing(adjective, understanding, keen, sensible, certain) |
| knowledgeable(adjective, understanding, enthusiastic, alert, familiar) |
| sensible(adjective, understanding, keen, certain, alert) |
| thorough(adjective, thoughtful, sober, cautious, prudent) |
| advertent(correct, alert, intelligent, perceptive, attentive) |
| alive(adjective, enthusiastic, alert, familiar, intelligent) |
| deliberate(adjective, kind, friendly, alert, polite) |
| diligent(adjective, attentive, vigilant) |
| familiar(adjective, alert, wise, knowledgeable, responsive) |
| judicious(adjective, thoughtful, sober, cautious, perceptive) |
| meticulous(adjective, thoughtful, sober, cautious, prudent) |
| on guard(expression, adjective, idiom, adverb, alert) |
| safe(adjective, cautious, suspicious, wary, circumspect) |