Synonyms: alarm, alarum, alert, warning signal
Definition: an automatic signal (usually a sound) warning of danger
Similar words: sign, signal, signaling
Definition: any nonverbal action or gesture that encodes a message
Usage: signals from the boat suddenly stopped
Definition: a warning serves to make you more alert to danger
Similar words: warning
Definition: a message informing of danger
Usage: a warning that still more bombs could explode
Definition: condition of heightened watchfulness or preparation for action
Usage: bombers were put on alert during the crisis
Similar words: preparation, preparedness, readiness
Definition: the state of having been made ready or prepared for use or action (especially military action)
Usage: putting them in readiness; their preparation was more than adequate
Definition: warn or arouse to a sense of danger or call to a state of preparedness
Usage: The empty house alarmed him; We alerted the new neighbors to the high rate of burglaries
Similar words: warn
Definition: notify of danger, potential harm, or risk
Usage: The director warned him that he might be fired; The doctor warned me about the dangers of smoking
Definition: engaged in or accustomed to close observation
Usage: 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
Similar words: vigilant, wakeful, open-eyed, argus-eyed
Definition: carefully observant or attentive; on the lookout for possible danger
Usage: a policy of open-eyed awareness; the vigilant eye of the town watch; there was a watchful dignity in the room; a watchful parent with a toddler in tow
Similar words: fly
Definition: (British informal) not to be deceived or hoodwinked
Similar words: wide-awake, heads-up
Definition: fully alert and watchful
Usage: played heads-up ball
Similar words: sleepless, lidless
Definition: always watchful
Usage: to an eye like mine, a lidless watcher of the public weal- Alfred Tennyson
Definition: mentally perceptive and responsive
Usage: an alert mind; alert to the problems; alive to what is going on; awake to the dangers of her situation; was now awake to the reality of his predicament
Similar words: cognisant, cognizant, aware
Definition: (sometimes followed by `of') having or showing knowledge or understanding or realization or perception
Usage: was aware of his opponent's hostility; became aware of her surroundings; aware that he had exceeded the speed limit
Synonyms: rattling, alert, spanking, snappy, zippy, brisk, merry, lively
Definition: quick and energetic
Usage: a brisk walk in the park; a lively gait; a merry chase; traveling at a rattling rate; a snappy pace; a spanking breeze
Similar words: energetic
Definition: possessing or exerting or displaying energy
Usage: an energetic fund raiser for the college; an energetic group of hikers; it caused an energetic chemical reaction