困難

In a sentence

• そのプロジェクトを成功させることは、困難でした。

  Achieving success in that project was challenging.

  Used as a noun describing the difficulty of succeeding in an endeavor.

• 困難な状況でも、私はあきらめませんでした。

  Even in a difficult situation, I did not give up.

  Used as an adjective modifying a noun to describe the challenging nature of the situation.

• 彼女の支援があったおかげで、困難を乗り越えることができました。

  Thanks to her support, I was able to overcome difficulties.

  Used as a noun referring to obstacles or challenges that were overcome.