unresistant

adjective
un·​re·​sis·​tant | \ˌən-ri-ˈzi-stənt \

Definition of unresistant 

: not giving, capable of, or exhibiting resistance : not resistant insects unresistant to pesticides

First Known Use of unresistant

1832, in the meaning defined above

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The first known use of unresistant was in 1832

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