- Not trivial; of some importance.
- Mathematics Of, relating to, or being an expression in which at least one variable is not equal to zero.
(comparative more nontrivial, superlative most nontrivial)
From non- +"Ž trivial
Not lightweight. Nontrivial is a favorite word among programmers and computer people for describing any task that is not quick and easy to accomplish. It may mean "extremely" difficult and time consuming. Therefore, since many programmers are unbridled optimists, take the word seriously!