Tales of his extremebehaviour on set were once rife.
Times, Sunday Times (2010)
But his reputation in the ring was overshadowed by his equally extremebehaviour outside of it.
Times, Sunday Times (2013)
Seediva behaviour
Definition of 'extreme'
extreme
(ɪkstriːm)Explore 'extreme' in the dictionary
adjective
You use extreme to describe situations and behaviour which are much more severe or unusual than you would expect, especially when you disapprove of them because of this.