detecting

attentive discerning discriminating intelligent mindful perceptive vigilant

advertent alive bright clear-sighted comprehending considering contemplating correct deducing discovering eager eagle-eyed heedful intentive interested keen not missing a trick 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

audition distinguishing ear earshot effect extent faculty listening perception range reach recording sense

auditory auditory range hearing distance