To Be Sad About
To Be Saddened By
transitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means sad and this verb is transitive, so it means to be sad about something. Boohoo.
If you're going to be sad about something right now, it will be kana (かな). Don't use kana when you're trying to learn kanji! You'll be sad forever if you're stuck using kana your whole life, so don't let that habit start now, friend.
彼女が悲しむのは見たくありません。
I don't want to see her sad.
人間だけではなく、動物も仲間の死を悲しみます。
Animals, as well as humans, are saddened by the deaths of their friends.
彼女は愛するペットが亡くなってとても悲しんでいます。
She was very saddened by the loss of her beloved pet.