non-trivial

Not easily dismissed

Non-trivial describes something requiring real effort, complexity, or significance—the opposite of easy or negligible.

In computing and mathematics, a non-trivial solution or problem is one that isn't obvious or degenerate: Implementing that feature is non-trivial.

More broadly, it signals that something shouldn't be dismissed or underestimated: The cost savings are non-trivial.

The word often appears in technical contexts where speakers want to flag genuine difficulty without overstating it.

significant

important

Of great significance

material · relevant · pertinent · momentous · weighty · serious · major · critical · vital · essential

complex

intricate

Elaborately detailed, many parts

multifaceted · elaborate · convoluted · tangled · byzantine · layered · dense · abstruse · recondite · arcane

challenging

difficult

Requiring much effort

taxing · exacting · strenuous · rigorous · formidable · daunting · grueling · laborious · onerous · testing

Opposites
complexity/difficulty

non-trivialtrivial

Lacking significance or weight

simple · easy · straightforward · elementary · basic

significance/importance

non-trivialtrivial

Lacking significance or weight

insignificant · inconsequential · negligible · unimportant · minor

obviousness

non-trivialtrivial

Lacking significance or weight

obvious · self-evident · apparent · transparent · patent

Family

nontrivial

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