解とき難がたい

i-adjective

difficult to solve; intractable

Used for problems, puzzles, or situations that are hard to resolve or unravel. Often implies a complex or stubborn nature.

• この問もん題だいは解とき難がたい。

  This problem is difficult to solve.

• 解とき難がたい謎なぞに挑いどむ。

  Take on an intractable mystery.