Reasonable

An innocuous-looking adjective that nonetheless exercises the wits of attorneys the world over, especially when modified by the word "commercially reasonable manner|commercially]]".

As long ago as 1947 Lord Greene MR issued the seminal words on the topic in the famous case of AP Picture Houses v Wednesbury

See

• AP Picture Houses v Wednesbury (includes link to transcript)
• commercially reasonable manner
• Barclays v Unicredit