| watchful(adjective, feature, characteristic, understanding, keen) |
| attentive(adjective, feature, characteristic, understanding, keen) |
| vigilant(adjective, activity, feature, characteristic, understanding) |
| heedful(adjective, feature, characteristic, care, sensible) |
| intelligent(adjective, smart, attentive, sharp, bright) |
| observant(adjective, feature, characteristic, understanding, strong) |
| sharp(adjective, activity, understanding, strong, open) |
| keen(adjective, good, clear, understanding, strong) |
| alarm(noun, verb, guide, caution, device) |
| quick(adjective, activity, understanding, pleasant, keen) |
| active(adjective, adverb, activity, good, clear) |
| wary(adjective, keen, sensible, deliberate, lively) |
| cautious(adjective, adverb, keen, care, sensible) |
| aware(adjective, feature, characteristic, understanding, open) |
| clever(adjective, sharp, ability, smart, bright) |
| careful(adjective, keen, sensible, excited, lively) |
| caution(noun, verb, order, give, declare) |
| awake(verb, adjective, activity, understanding, open) |
| signal(noun, verb, order, sign, notice) |
| circumspect(adjective, keen, sensible, deliberate, lively) |