I never thought it would be this hard to solve the problem.

Translation language

Sentence

Narrator

Don't underestimate the difficulty of solving this problem.

I usually find problem-solving easier, but this one proved unexpectedly challenging.

Did you find this problem harder than you anticipated?

If I had known how difficult this problem would be, I would have approached it differently.

I underestimated the complexity of the problem's solution.

This problem turned out to be way harder than I thought.

I didn't expect this problem to be so tough.

Did not anticipate or expect.

This difficult or challenging.