1A noun/na-adjective meaning safety, security, peace, or calm.
地震の後、町の人々の無事が確認された。
After the earthquake, the townspeople's safety was confirmed.
無事な生活を送りたいと願っている。
I wish to lead a peaceful, uneventful life.
皆の無事を祈る。
I pray for everyone's safety.
2As an adverb (無事に), meaning safely, without incident, or successfully.
家族は無事に帰宅した。
The family returned home safely.
手術は無事に終わった。
The surgery finished without incident.
荷物が無事に届きました。
The package arrived safely.
3Refers to being in good health or well-being; used to describe someone's state.
おかげさまで母は無事です。
Thanks to you, my mother is doing well.
遠くにいる子どもの無事を願っている。
I wish for the well-being of my child who is far away.
4Obsolete: once could mean inaction or ennui; no longer commonly used in this sense.