彼女がどれほど悲しんだかは想像に難くない。

It is not hard to imagine how deeply she grieved.

この城は守るに易く、攻めるに難い。

This castle is easy to defend and hard to attack.

両親の苦労は察するに難くない。

It is not difficult to guess what hardships his parents went through.

あの夏の旅は忘れ難い思い出になった。

That summer trip became an unforgettable memory.

彼がそんなことをしたとは信じ難い。

It is hard to believe that he did such a thing.

耐え難い痛みに思わず声を上げた。

I cried out in spite of myself at the unbearable pain.