not missing a trick

attentive discerning discriminating intelligent mindful perceptive vigilant

advertent alive bright clear-sighted comprehending considering contemplating correct deducing detecting discovering eager eagle-eyed heedful intentive interested keen obedient observative on one's toes on the ball penetrating questioning quick regardful searching sensitive sharp sharp-eyed surveying understanding wide-awake

careless heedless inattentive neglectful negligent unaware undiscriminating

indifferent thoughtless unmindful unobservant unwatchful

attentive careful cautious observant suspicious vigilant wary

alert

all ears chary circumspect glued guarded heedful hooked keen on guard on one's toes on the ball on the job on the qui vive on the watch open-eyed prepared ready see after see to unsleeping wakeful wide-awake with eyes peeled

careless heedless inattentive incautious indiscreet rash thoughtless uncareful unobservant

negligent