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un·sus·cep·ti·ble | \ ˌən-sə-ˈsep-tə-bəl 
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\Definition of unsusceptible
: not open, subject, or susceptible unsusceptible to interference She was not unsusceptible to such an appeal …— Booth Tarkington
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Time Traveler for unsusceptible
The first known use of unsusceptible was in 1734
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