noun
tort; illegal act; wrongful act
Primarily a legal term for a civil wrong (tort) that causes harm or loss, but also used more broadly for any illegal or wrongful act. Often appears in legal contexts such as 不法行為法 (tort law).
不法行為による損害賠償を請求する。
Claim damages for a tort.
彼の行為は明らかな不法行為だ。
His act is clearly an illegal act.