Englishhair-splitting
adjective
legal experts have a particularly hair-splitting mentality:
quibbling, fault-finding, niggling, cavilling, carping, captious, critical, criticizing, disapproving, censorious, judgemental, overcritical, hypercritical, pedantic, punctilious, pettifogging;
Scottish, & Irish pass-remarkable;
informal nitpicking, picky;
British, informal pernickety;
North American, informal persnickety;
archaic nice, overnice.
hair-splitting Oxford Dictionary of English