解かい決けつ不ふ能のう

na-adjective, noun which may take the genitive case particle 'no'

unsolvable; insoluble; unresolvable

Describes a problem, puzzle, or situation that cannot be solved or resolved. Often used in formal or technical contexts.

• この問もん題だいは解かい決けつ不ふ能のうだ。

  This problem is unsolvable.

• 解かい決けつ不ふ能のうな謎なぞに挑いどむ。

  Take on an insoluble mystery.