unsusceptible

adjective un·sus·cep·ti·ble \ ˌən-sə-ˈsep-tə-bəl \

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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