nonfissionable

adjective
non·​fis·​sion·​able | \ˌnän-ˈfi-shə-nə-bəl, -zhə-;-ˈfish-nə-, -ˈfizh-\

Definition of nonfissionable 

: not capable of undergoing fission : not fissionable nonfissionable uranium

First Known Use of nonfissionable

1946, in the meaning defined above

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The first known use of nonfissionable was in 1946

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