1
as in awake
paying close attention usually for the purpose of anticipating approaching danger or opportunity
she needed to stay alert throughout the train ride so as not to miss her stop
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2
as in cautious
having or showing a close attentiveness to avoiding danger or trouble
warned us to be alert to the presence of pickpockets on the crowded bus
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3
as in intelligent
having or showing quickness of mind
an alert and well-trained sheep dog who can handle difficult situations
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4
as in quick
having or showing the ability to respond without delay or hesitation
an alert force of commandos, ready to go on a mission at a moment's notice
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Merriam-Webster unabridged



