非ひ自じ明めい

na-adjective

nontrivial; non-obvious

Technical term used in mathematics, logic, and formal contexts to describe a solution, proof, or fact that is not immediately apparent or requires significant reasoning.

• この定てい理りの証しょう明めいは非ひ自じ明めいな補ほ題だいに依い存ぞんしている。

  The proof of this theorem relies on a nontrivial lemma.

• 一いっ見けん簡かん単たんそうに見みえるが、実じつは非ひ自じ明めいな問もん題だいだ。

  It looks simple at first glance, but it is actually a non-obvious problem.