vigilant
vig-i-lant
adjective
Keeping careful watch for possible danger or difficulties; alert and attentive.
"The security guard remained vigilant all night."
Thesaurus
Synonyms: wakeful, alert, open-eyed, watchful, argus-eyed
vig-i-lant
Keeping careful watch for possible danger or difficulties; alert and attentive.
"The security guard remained vigilant all night."
Synonyms: wakeful, alert, open-eyed, watchful, argus-eyed