It was a very difficult decision to make.

这是个非常难作的决定。

《柯林斯英汉双解大词典》

It's a very difficult decision.

这是一个非常难于做出的决定。

youdao

And I find myself forced to make a very difficult decision.

他们花了很长时间才作出了一个艰难的决定。

youdao

The parents find a way to pay for their endless medical expenses that requires them to make a very difficult moral decision.

VOA: special.2009.10.12

"This has been a very difficult decision for me and my family, " he said.

CNN: Sen. Bob Graham won't run for re-election

For the past several weeks, I have been struggling with a very difficult decision.

CNN: Transcript: Jeffords statement

You say it was a very difficult decision, though, and that is actually for you a moral issue.

CNN: Transcript of May 'CNN Money Summit: Money & Main St.'