Allow me describe my version of the word “tough” since it is clearly a qualitative measure and therefore subject to speculation and opinion.
Tough is not being a goon. Tough cannot be measured in fighting majors. Being an enforcer does not automatically qualify as being tough.
There are many kinds of tough. Tough is a style of play. Tough is an intrinsic value. Tough is the guys on this list.
This list is in no particular rank or order since as previously mentioned, toughness is solely something that can be observed, and not measured.