| wide-awake(adjective, adverb, keen, sharp, smart) |
| wide awake(expression, adjective, idiom, sharp, bright) |
| conscious(adjective, understanding, open, keen, sharp) |
| observing(adjective, understanding, keen, sensible, certain) |
| perspicacious(adjective, understanding, keen, bright, perceptive) |
| sharp-eyed(adjective, intelligent, attentive, watchful, vigilant) |
| sprightly(adjective, good, clear, strong, pleasant) |
| tocsin(noun, sign, caution, signal, alarm) |
| wink(noun, verb, sign, indicate, indication) |
| alarum(noun, signal, alarm, warn) |
| animate(verb, adjective, strong, produce, keen) |
| beacon(noun, light, guide, indication, alarm) |
| cue(noun, verb, give, declare, sign) |
| discerning(adjective, understanding, keen, sharp, smart) |
| energetic(adjective, good, clear, moving, pleasant) |
| expeditious(adjective, activity, keen, energetic, active) |
| horn(noun, caution, signal, alarm, warning) |
| meticulous(adjective, careful, thoughtful, sober, attentive) |
| notice(noun, caution, alarm, counsel, warning) |
| tip off(noun, verb, expression, phrasal verb, order) |