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The sensitivity or insensitivity of a human, often considered with regard to a particular kind of stimulus, is the strength of the feeling it results in, in comparison with the strength of the stimulus. The concept applies to physical as well as emotional feeling.
- Not reacting to the emotions or situation of other people or not caring about others, tactless.
- Not reacting to something or not appreciating something.
- Not experiencing physical sensations, numb.