| expert(adjective, smart, bright, familiar, intelligent) |
| mindful(adjective, alert, intelligent, considerate, aware) |
| on guard(expression, adjective, keen, sharp, bright) |
| on the lookout(expression, adjective, sharp, lively, alert) |
| prompt(adjective, smart, bright, intelligent, responsive) |
| quick-witted(adjective, sharp, smart, bright, familiar) |
| savvy(adjective, smooth, keen, sharp, smart) |
| wakeful(adjective, keen, sharp, bright, alert) |
| wary(adjective, keen, sharp, bright, lively) |
| accomplished(adjective, good, smart, intelligent, practical) |
| acute(adjective, smooth, keen, sharp, smart) |
| adequate(pleasant, fair, agreeable, suitable, decent) |
| advertent(alert, intelligent, attentive, watchful, sharp-eyed) |
| agile(smart, bright, intelligent, clever, slick) |
| apt(adjective, good, smooth, sharp, smart) |
| assiduous(considerate, responsive, helpful) |
| brainy(adjective, smooth, keen, sharp, smart) |
| brilliant(adjective, smart, bright, familiar, intelligent) |
| cagey(adjective, smooth, keen, sharp, smart) |
| circumspect(adjective, keen, sharp, bright, lively) |