noun
indecent act; sexual misconduct
Legal and formal term for indecent acts, especially molestation or indecent exposure. Often used in news reports and legal contexts.
電車内でのわいせつ行為は犯罪です。
Indecent acts on trains are a crime.
彼はわいせつ行為の疑いで逮捕された
He was arrested on suspicion of committing an indecent act.