Entry 1 sense Webster, 1913 Insensitive /ĭnˌ-sĕn'-sət-ĭv/ · In·sen·si·tive · IPA /ɪnˈsɛnsɪtɪv/ 01 a. Not sensitive; wanting sensation, or wanting acute sensibility. 1. Not sensitive; wanting sensation, or wanting acute sensibility.