Synset:alert
Examples:
- caught by a couple of alert cops
- alert enough to spot the opportunity when it came
- constantly alert and vigilant, like a sentinel on duty
Antonyms:unalert
Derivationally Related Form:alertwatchfulnessalertness
Inherited Hypernyms:alert
Similar to:argus-eyed open-eyed vigilant wakeful fly heads-up wide-awake lidless sleepless
See also:awake lively wary