/ ɪnˌsensəˈbɪlətɪ; NAmE / noun [ U ]
1.
( formal ) the state of being unconscious
2.
the fact of not being able to react to a particular thing :
insensibility to pain
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WORD ORIGIN
late Middle English : partly from Old French insensibilite or late Latin insensibilitas (from in- not + Latin sensibilis sensible, from sensus sense), partly from in- without + sensibility .