noun
Refers to a person's inner drive, morale, or emotional disposition. Often used in compounds like 意気込み (enthusiasm) or 意気消沈 (dejection).
彼の意気に感じて、私も協力することにした。
Moved by his spirit, I decided to cooperate as well.
チームの意気が上がらない。
The team's morale is low.
Composed of 意 (mind, thought) and 気 (spirit, energy). The combination has been used in classical Chinese and was adopted into Japanese to express one's mental and emotional state.