act, be lively
When you are vigilant, you are keenly watchful, careful, or attentive to a task or situation.
Someone who possesses vigor has energy, strength, and power.
a period of sleeplessness
the process of paying close and continuous attention
member of a vigilance committee
characterized by forceful and energetic action or activity
heighten or intensify
imparting strength and vitality
close observation of a person or group (usually by the police)
One who watches over another; an overseer; a spy; a supervisor.
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