To Worry
To Be Troubled
godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means worry so the verb vocab version is to worry.
The reading is the same as what you learned with the kanji, so no need to worry about it.
出産後も仕事を続けるかを悩む女性は多い。
Many women wonder whether to continue working after giving birth.
近所の人からの嫌がらせに悩んでいます。
I am troubled by harassment from my neighbors.
まだ若いのに、何をそんなに悩む必要があるんだよ！
You are still young, what do you need to be so worried about?
「どうしたの？何を悩んでいるの？」「昨日、彼女に振られたんだ。」
"Hey! What’s troubling you?" "My girlfriend dumped me last night."