1. (a.) Imperceptible; destitute of the power of feeling or perceiving; as, insensible to cold weather or pain\.

2. (a.) Not susceptible of emotion or passion; void of feeling; apathetic; unconcerned; indifferent; as, insensible to danger, fear, love, etc.; -- often used with of or to.

3. (a.) Incapable of being perceived by the senses; imperceptible. Hence: Progressing by imperceptible degrees; slow; gradual; as, insensible motion.

4. (a.) Not sensible or reasonable; meaningless.

a stranger to abiotic absorbed anesthetic anesthetized apathetic asleep azoic behind the curtain behind the scenes benumbed blind blind to blindfold blindfolded bloodless blunt callous camouflaged caught napping cold comatose concealed cool dead dead to deadened deaf deaf to dim-sighted disguised dispassionate dull dumb emotionless engrossed exanimate hard hardened hidden impalpable impassible impassive imperceptible imperceptive impercipient impervious imponderable in ignorance of inanimate inanimated inappreciable incognizant inconsiderate indifferent indiscernible indurated inert insensate insensible to insensitive insentient intangible intent invisible latent lifeless lost to mind-blind mindless mute myopic napping nearsighted nonconceiving nonconscious nonliving nonunderstanding not with it numb numbed obdurate oblivious obtuse out out cold out of it out of sight pachydermatous phlegmatic preoccupied purblind rapt rocky secret senseless shortsighted sightless soulless stoic stolid submerged thick-skinned thick-witted thoughtless torpid unaffected unanimated unapparent unappreciable unapprehending unaware unaware of unbeheld unbeholdable uncomprehending unconscious unconscious of undiscernible undiscerning unfeeling unfelt unhearing uninsightful unknowing unmindful unmindful of unmoved unnoticed unobservable unobserved unperceivable unperceived unperceiving unperceptive unprehensive unrealized unrealizing unseeable unseeing unseen unsusceptible unsuspecting untouched unviewed unwitnessed unwitting viewless witless