beyond the pale
From pale (“jurisdiction of an authority, territory under an authority's jurisdiction”), suggesting that anything outside the authority's jurisdiction was uncivilized. The phrase was in use by the mid-17th century, and may be a reference to the general sense of boundary, but is often understood to refer specifically to the English Pale in Ireland. In the nominally English territory of Ireland, only the pale fell genuinely under the authority of English law, hence the terms within the pale and beyond the pale.
- (idiomatic) Describing behaviour that is considered to be outside the bounds of morality, good behaviour or judgement in civilised company.