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in·sen·si·ble / inˈsensəbəl/ • adj. 1. without one's mental faculties, typically a result of violence or intoxication; unconscious: they knocked each other insensible with their fists insensible with drink. ∎  (esp. of a body or bodily extremity) numb; without feeling: the horny and insensible tip of the beak.2. (insensible of/to) unaware of; indifferent to: they slept on, insensible to the headlight beams. ∎  without emotion; callous.3. too small or gradual to be perceived; inappreciable: varying by insensible degrees.DERIVATIVES: in·sen·si·bly / -blē/ adv.