| acute(adjective, understanding, strong, keen, sharp) |
| diligent(adjective, attentive, vigilant) |
| loyal(adjective, attentive, compliant, submissive, docile) |
| punctilious(adjective, careful, thoughtful, sober, prudent) |
| sensitive(adjective, understanding, open, kind, keen) |
| wakeful(adjective, keen, alert, careful, restless) |
| advertent(adjective, sympathetic, alert, witting, attentive) |
| alive(adjective, cool, sensible, alert, significant) |
| bright(adjective, open, cool, sharp, friendly) |
| concerned(adjective, kind, friendly, deliberate, alert) |
| conscientious(adjective, careful, thoughtful, sober, considerate) |
| considerate(adjective, kind, reasonable, friendly, sensible) |
| considering(adjective, alert, attentive, watchful, circumspect) |
| discreet(adjective, understanding, kind, keen, sharp) |
| faithful(attentive, compliant, submissive, docile, deferential) |
| hawk-eyed |
| perspicacious(adjective, person, understanding, keen, sharp) |
| searching(adjective, alert, attentive, watchful, penetrating) |
| shrewd(adjective, understanding, sharp, smart, significant) |
| solicitous(adjective, kind, deliberate, alert, careful) |