IPA: /ˈrɒŋˌduːər/
KK: /ˈrɔŋˌduər/
A person who commits a wrongful act or behaves in a morally or ethically wrong way.
The police arrested the wrongdoer after the investigation revealed his involvement in the crime.
Wrongdoer → It is formed from "wrong" (from Old English *wrang*, meaning morally or ethically incorrect) and "doer" (from Old English *dōian*, meaning to perform or act). A wrongdoer is someone who performs actions that are morally or ethically incorrect.
Think of someone who acts in a 'wrong' way — 'wrong' means morally incorrect, and 'doer' refers to a person who acts.