Mood
Temper
noun
Machines dislike everything. Their mood, or temper, is very sour. What about your mood?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. けん gets changed to げん, though, so don't let that ruin your mood.
今日のお母さんの機嫌はどう？
What kind of mood is mom in today?
おじいちゃん、めっちゃ機嫌いいね！どうしちゃったの？
Grandpa is in a really good mood! What happened?
父は朝から機嫌が悪い。どうやら仕事で何かあったようだ。
My father has been in a bad mood since this morning. Apparently, something had happened at work.