Splendid, magnificent, or admirable; excellent or superb (used as a na-adjective or adverb).
彼女のピアノ演奏は本当に見事だった。
Her piano performance was truly splendid.
見事な景色をカメラに収めた。
I captured a magnificent view with my camera.
庭の手入れが見事で、季節ごとに花が咲く。
The garden is beautifully maintained and flowers bloom each season.
彼は見事に問題を解決した。
He solved the problem admirably.
Utter or complete — often used as '見事に～する' to mean to do something thoroughly (e.g. a total defeat or complete failure).
計画は見事に失敗した。
The plan failed completely.
相手チームに見事にやられてしまった。
We were completely beaten by the opposing team.
彼は規則を見事に破った。
He flagrantly (completely) broke the rules.
Something worth seeing; a spectacle (archaic or literary noun usage).
あの祭りは毎年見事で、多くの人が訪れるという。
That festival is said to be a spectacle every year, attracting many visitors.
古い記録には見事と称された城の絵が残っている。
In old records remains a picture of a castle that was called a spectacle.