From Longman Dictionary of Contemporary Englishhave a perfect right to do somethinghave a perfect right to do somethingused to emphasize that it is reasonable for someone to do something He has a perfect right to know what’s happening. → perfect
Examples from the Corpus
have a perfect right to do something• They have a perfect right to object to it.• You have a perfect right to say "no" if you don't want to do it. 