barely able to be perceived; "the transition was almost indiscernible"; "an almost insensible change"
{s} unconscious, unable to sense or feel; not affected by a certain feeling or emotion; unaware, unconcerned, apathetic; not perceivable
unresponsive to stimulation; "he lay insensible where he had fallen"; "drugged and senseless" incapable of physical sensation; "insensible to pain"; "insensible earth