: a person who criticizes someone or something often in a way that is not fair or reasonable.

What is a fault finding person?

noun. a person who habitually finds fault, complains, or objects, especially in a petty way.

What do you call someone who always finds faults?

Some common synonyms of faultfinding are captious, carping, censorious, critical, and hypercritical. While all these words mean "inclined to look for and point out faults and defects," faultfinding implies a querulous or exacting temperament. a faultfinding reviewer.