noun
Refers to one's physical or emotional state at a given moment. Often used in expressions like 気分がいい (feel good) or 気分が悪い (feel sick/unwell).
今日は気分がいい。
I feel good today.
彼は気分が悪そうだ。
He looks like he's feeling unwell.
Standard kanji spelling; high-frequency word.
気持ち is more general and can refer to both physical sensations and emotional feelings, while 気分 emphasizes one's current mood or physical condition.
機嫌 often refers to a person's mood as expressed outwardly, especially in social contexts (e.g., 機嫌がいい means 'in a good mood'). 気分 is more about internal state.
Compound of 気 (ki, 'spirit; mind') and 分 (bun, 'part; portion'), literally 'a portion of spirit/mind', referring to one's current mental or physical state.