Itchy
い adjective
You can guess this is an adjective from the い at the end. The meaning for the kanji is itchy, and the adjective version is itchy too.
This word uses the same reading as the one you learned with the kanji: かゆ.
鼻の穴が痒い。
My nostrils are itchy.
一週間シャワーを浴びてないから頭が痒い。
My head is itching because I haven't showered in a week.
夜も寝れないぐらい痒くて、めっちゃ寝不足なんだよね。
I'm so itchy that I can't sleep at night, and I'm totally sleep-deprived.