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nontrivial

adjective

/ˌnɒnˈtrɪviəl/

Meaning

Not simple or easy; requiring effort or significant thought.

Solving the equation turned out to be a nontrivial task.

complex, difficult, challenging, demanding, tough

easy, simple, trivial

nontrivial problem, nontrivial solution, nontrivial effort, nontrivial challenge

happening not long ago; new; current;

More than is necessary, normal, or desirable; immoderate.

used as a temporary substitute; improvised

Deliberate and unprovoked; reckless or cruel.

silent; unable to speak; without sound

showing great care, attention, and diligence in work or tasks