If you are insensible to a physical sensation, you are unable to feel it. Insensible is a formal word.
Insensible is not the opposite of sensible. If someone behaves in a way that is not sensible, you do not say that they are 'insensible'. You say, for example, that they or their actions are silly or foolish.
| Adj. | 1. | insensible - incapable of physical sensation; "insensible to pain"; "insensible earth" incognizant, unaware - (often followed by `of') not aware; "seemed unaware of the scrutiny"; "unaware of the danger they were in"; "unaware of the newborn hope"; "the most unaware person I've known" unconscious - not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead; "lay unconscious on the floor" insensitive - not responsive to physical stimuli; "insensitive to radiation" insensitive - deficient in human sensibility; not mentally or morally sensitive; "insensitive to the needs of the patients" |
| 2. | insensible - unaware of or indifferent to; "insensible to the suffering around him" insensitive - deficient in human sensibility; not mentally or morally sensitive; "insensitive to the needs of the patients" | |
| 3. | insensible - barely able to be perceived; "the transition was almost indiscernible"; "an almost insensible change"imperceptible, unperceivable - impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch" | |
| 4. | insensible - unresponsive to stimulation; "he lay insensible where he had fallen"; "drugged and senseless" unconscious - not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead; "lay unconscious on the floor" |