Antonyms of adj fissionable

1 sense of fissionable

Sense 1
fissionable (vs. nonfissionable), fissile -- (capable of undergoing nuclear fission; "a fissionable nucleous"; "fissionable material")

nonfissionable (vs. fissionable) -- (not capable of undergoing fission)

Similarity of adj fissionable

1 sense of fissionable

Sense 1
fissionable (vs. nonfissionable), fissile -- (capable of undergoing nuclear fission; "a fissionable nucleous"; "fissionable material")