nontrivial
adjective
non·triv·i·al
ˌnän-ˈtri-vē-əl
1
: not trivial : significant, important
a small but nontrivial amount
… engineering a power plant around the technology is a nontrivial problem.—John Fleck
2
mathematics
: having the value of at least one variable or term not equal to zero
a nontrivial solution
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Merriam-Webster unabridged
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