Speaking at the Business Commitment to the Environment awards, he said that the results for last year were furtherproof that a focus on sustainability can be good for profits.
Times, Sunday Times (2011)
If they required any furtherproof, it came in the 76th minute.
The Sun (2006)
That's if you needed furtherproof this is really the end.
The Sun (2014)
Definition of 'proof'
proof
(pruːf)Explore 'proof' in the dictionary
variable noun [NOUN that]
Proof is a fact, argument, or piece of evidence which shows that something is definitely true or definitely exists.