| perceptive(adjective, alert, intelligent, attentive, watchful) |
| prepared(adjective, ready, alert, careful, cautious) |
| questioning(adjective, correct, alert, intelligent, attentive) |
| quick(adjective, alert, intelligent, perceptive, attentive) |
| ready(adjective, alert, careful, cautious, attentive) |
| regardful(adjective, correct, alert, intelligent, attentive) |
| searching(adjective, correct, alert, intelligent, attentive) |
| see after(expression, adjective, ready, alert, careful) |
| see to(expression, adjective, ready, alert, careful) |
| sensitive(adjective, correct, alert, intelligent, attentive) |
| sharp(adjective, alert, intelligent, perceptive, attentive) |
| sharp-eyed(adjective, correct, sympathetic, alert, intelligent) |
| surveying(adjective, correct, alert, intelligent, attentive) |
| suspicious(adjective, alert, careful, cautious, attentive) |
| understanding(adjective, correct, alert, intelligent, attentive) |
| unsleeping(adjective, alert, careful, cautious, attentive) |
| vigilant(adjective, alert, careful, intelligent, cautious) |
| wakeful(adjective, alert, careful, cautious, attentive) |
| wary(adjective, alert, careful, cautious, attentive) |
| watchful(adjective, alert, intelligent, attentive, observant) |