The phrase "hardest person" refers to someone who is difficult to deal with or please.
Sentences with «hardest person»
I was writing in an open email about people and how hard people work to discourage people from seeing my work. (relevantmagazine.com)
«Nor do I have a suitable bunch of hard people who can beat up the church commissioners until they do what I want,» he said. (politics.co.uk)
Credit scoring on renters insurance hits hardest the people who need the coverage the most, so a lack of credit as a rating factor helps to bring equality to insurance markets. (effectivecoverage.com)