on guard Synonyms

upon one's guard on your guard on one's guard with weather eye open leery leary on the qui vive wide-awake watchful watch wary wakeful vigilant looking for guarding handling with kid gloves not missing a trick on the watch on the lookout on the alert on one's toes on alert on the ball all ears tutelar sleepless safe defensively defensive circumspect chary cautious careful canny aware awake attentive discreet gingerly guarded regardful ready prudent open-eyed observant mindful lidless insomnious heedful guard