The 'Wednesbury unreasonableness' standard in judicial review allows courts to strike down administrative decisions that are so irrational that no reasonable authority could have arrived at them.

Wednesbury principle (Associated Provincial Picture Houses v. Wednesbury Corporation, 1948; applied in India): Courts can intervene if administrative decision is: (a) So unreasonable that no reasonable authority could have made it, (b) Based on irrelevant considerations or ignoring relevant ones, (c) Mala fide or arbitrary. High threshold: Courts don't substitute their wisdom for administrators'; only check for extreme irrationality. Balances judicial oversight with respect for executive expertise.