English
Wednesbury unreasonable
From Wednesbury + unreasonable.
A compound of Wednesbury + unreasonable
Middle English Wadnesberie
English Wednesbury
Middle English unresonable
English unreasonable
The story
Wednesbury refers to the case of Associated Provincial Picture Houses Ltd. v Wednesbury Corporation, in which the Court of Appeal of England and Wales refused to quash a decision by the Wednesbury Corporation to ban children under 15 from entering cinemas on Sundays, and laid down in what cases courts could quash unreasonable administrative decisions.
Today it means
adj In judicial reviews of administrative decisions: being unreasonable to the extent that no reasonable person or authority would make such a decision.
Language periods are conventional ranges, not dates for this word.
Etymograph / Wednesbury unreasonable