Adjectives

(a)insensibleincapable of physical sensation“insensible to pain”, “insensible earth”
(s)insensible, unaffectedunaware of or indifferent to“insensible to the suffering around him”
(s)indiscernible, insensible, undetectablebarely able to be perceived“the transition was almost indiscernible”, “an almost insensible change”
(s)insensible, senseless, out of itunresponsive to stimulation“he lay insensible where he had fallen”, “drugged and senseless”