noun, noun or participle which takes 'suru', intransitive verb, noun which may take the genitive case particle 'no'
accidental; incidental; sudden outbreak
Describes events that happen by chance, without planning or intent. Often used in formal or news contexts for accidents, incidents, or unexpected occurrences. Can be used as a noun, with する (intransitive), or as a の-adjective.
事故は偶発的に起こった。
The accident happened accidentally.
The train was delayed due to an incidental problem.
この事件は偶発したものではない。
This incident was not a sudden outbreak.