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Adjective: vigilant  vi-ju-lunt
  1. Carefully observant or attentive; on the lookout for possible danger
    "the vigilant eye of the town watch"
    - argus-eyed, open-eyed, wakeful

See also: alert, vigilance, vigilantly, watchful

Encyclopedia: Vigilant

Nearest

viewpoint
Vigdis Finnbogadottir
Vigee-Lebrun
vigesimal
vigil
vigil candle
vigil light
vigilance
vigilance committee
vigilance man
vigilant
vigilante
vigilantism
vigilantly
Vigna
Vigna aconitifolia
Vigna angularis
Vigna caracalla
Vigna radiata
Vigna sesquipedalis
Vigna sinensis