i-adjective
Describes a person's feeling of not wanting to do something, often because it goes against their true intention or desire.
彼は本意なさそうに返事をした。
He replied reluctantly.
i-adjective
Expresses a feeling of disappointment or regret when a situation turns out contrary to one's wishes or expectations.
雨で試合が中止になって本意ない。
It's unfortunate that the game was canceled due to rain.