unsusceptible

adjective
un·​sus·​cep·​ti·​ble | \ ˌən-sə-ˈsep-tə-bəl How to pronounce unsusceptible (audio) \

Definition of unsusceptible

: not open, subject, or susceptible unsusceptible to interference She was not unsusceptible to such an appeal …— Booth Tarkington

First Known Use of unsusceptible

1734, in the meaning defined above

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The first known use of unsusceptible was in 1734

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