i-adjective
unenthusiastic; halfhearted; not in the mood
Describes a lack of motivation or interest in doing something. Often used when someone feels reluctant or can't get into the right frame of mind.
今日は気乗りしないから、買い物は明日にする。
I'm not in the mood today, so I'll do the shopping tomorrow.
彼は気乗りしない様子で会議に参加した。
He joined the meeting with a halfhearted attitude.