observant Synonyms

law-abiding observing obedient practicing prudent quick quick-sighted regardful religious responsive sensitive sentient pious piercing observantine observational observative open-eyed penetrating penetrative perceptive percipient perspicacious sharp sharp-witted keen-eyed beady-eyed leery all ears on the ball on guard on one's toes on the lookout overprotective unperplexed on the qui vive sharp-eyed shrewd sleepless smart surveying thoughtful vigilant wakeful wary watchful wide-awake unsleeping noticing acceptant