condition of heightened watchfulness or preparation for action
warn or arouse to a sense of danger or call to a state of preparedness
engaged in or accustomed to close observation
mentally perceptive and responsive
quick and energetic
a warning serves to make you more alert to danger
an automatic signal (usually a sound) warning of danger
(usually followed by `of') without due thought or consideration
effortless and unstudied
marked by lack of attention or consideration or forethought or thoroughness; not careful
