警惕的近义词、同义词

watch over or shield from danger or harm; protect; "guard my possessions while I'm away"

judiciousness in avoiding harm or danger; "he exercised caution in opening the door"; "he handled the vase with care"

take precautions in order to avoid some unwanted consequence; "guard against becoming too friendly with the staff"; "guard against infection"

pay attention; be watchful; "Keep your eyes peeled for any policemen"

a warning serves to make you more alert to danger