extreme
/ɪkˈstriːm/
The word extreme generally describes something that is of the greatest possible degree, intensity, or the farthest from the norm. It can act as either an adjective or a noun, with specific nuances depending on how it is used. [1, 2]
Pretty much ‘what it says on the tin’ to quote the old advert. Not easy set a reference point as to what any particular individual would consider extreme as there will be variation of opinion but with experience you will recognise degrees of misalignment of die repairs that are beyond the norm. I would for example consider the F10 ‘triple F’ Penny to be extreme, the side by side 1’s of 1861 and similar.