| noun | condition of heightened watchfulness or preparation for action “bombers were put on alert during the crisis” |
| noun | a warning serves to make you more alert to danger |
| noun | an automatic signal (usually a sound) warning of danger |
| verb | warn or arouse to a sense of danger or call to a state of preparedness “The empty house alarmed him” |
| adjective | engaged in or accustomed to close observation “caught by a couple of alert cops” |
| adjective | quick and energetic “a brisk walk in the park” |
| adjective | mentally perceptive and responsive “an alert mind” |
| alert | adjective | engaged in or accustomed to close observation |
| alert | verb | warn or arouse to a sense of danger or call to a state of preparedness |
| alarm | noun | fear resulting from the awareness of danger |
| alert | noun | condition of heightened watchfulness or preparation for action |
| alertness | noun | lively attentiveness |
| watchfulness | noun | the process of paying close and continuous attention |
| briskness | noun | liveliness and eagerness |
| liveliness | noun | animation and energy in action or expression |
| zip | noun | forceful exertion |
| aliveness | noun | the condition of living or the state of being alive |