noun which may take the genitive case particle 'no', na-adjective, noun
unexpected joy; beyond expectations; unanticipated
Describes a positive outcome that exceeds what one hoped for or expected. Often used with nouns like 喜び, 成功, or 結果.
望外の成功に、彼は言葉を失った。
He was speechless at the unexpected success.
望外な結果が出て、とても嬉しい。
I'm very happy that we got a result beyond expectations.
Compound of 望 (hope, desire) and 外 (outside, beyond). Literally 'beyond hope', it conveys something exceeding one's wishes.