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Synonyms for Faultfinding (same or very similar meaning)

WordNet sense 1 (persistent petty and unjustified criticism):
carping

WordNet sense 2 (depending on judgment):
judgmental

WordNet sense 3 (tending to find and call attention to faults):
captious

WordNet sense 4 (marked by a tendency to find and call attention to errors and flaws):
critical


From the ODE community, based on WordNetadd/edit