| discreet(adjective, sensible, careful, thoughtful, cautious) |
| engrossed(adjective, set, determined, deep, fixed) |
| finical(adjective, fussy, discriminating, vigilant) |
| frighten(verb, alarm) |
| gay(adjective, keen, smart, bright, happy) |
| hint(noun, verb, order, give, declare) |
| knowing(adjective, understanding, keen, sharp, smart) |
| provident(adjective, care, careful, thoughtful, sober) |
| receptive(adjective, understanding, open, familiar, animate) |
| scrupulous(adjective, careful, thoughtful, sober, attentive) |
| shrewd(adjective, understanding, sharp, bright, careful) |
| sign(noun, notice, guide, hint, cry) |
| sleepless(adjective, keen, careful, restless, disturbed) |
| thorough(adjective, thoughtful, sober, prudent, wary) |
| alertness(noun, caution) |
| apt(adjective, smart, bright, intelligent, precise) |
| arouse(verb, produce, provoke, stimulate, excite) |
| assiduous(adjective, thoughtful, sober, considerate, cautious) |
| bell(noun, caution, signal, alarm, warning) |
| brainy(adjective, understanding, keen, sharp, smart) |