Here are some examples of how it can be used:
* 日本語は難しいです。 (Nihongo wa muzukashii desu.) - Japanese is difficult.
* この問題を解くのは難しい。 (Kono mondai o toku no wa muzukashii.) - This problem is difficult to solve.
* 彼は難しい顔をした。 (Kare wa muzukashii kao o shita.) - He made a difficult face.
It can also be used in more figurative ways to express a feeling of being overwhelmed or unsure:
* 私はどうすればいいのか難しいです。 (Watashi wa dou sureba iino ka muzukashii desu.) - I'm not sure what to do.
* 彼は難しい人だ。 (Kare wa muzukashii hito da.) - He's a difficult person to deal with.
Note: "Muzukashii" is pronounced as "moo-zoo-kah-shee".