- (Ireland) A fool, someone who is out of their senses, simpleton.
- "No, you omadhaun. It bites your shoulder, rips it right off." --Frank McCourt, Angela's Ashes, 1996.
- "...an Omadhaun is a man who began life with some sense, but lost most of it on his journey." --Andrew Barton ‘Banjo’ Paterson, A Story of Outback Life, 1906.
- "Tin trumpets some of the omadhauns had brought along to bray with...." --Hugh Kenner, A Colder Eye, 1983.
An Irish word that appears in English literature and political speech.