The term 'Quibbler' is used to describe someone who nitpicks, pettifogs, is a PEDANT, casuist, PRETENDER, or caviler. A NITPICKER is someone who focuses on minor details and often finds fault with others. A PETTIFOGGER is someone who quibbles over trivial matters and engages in legalistic arguments. A PEDANT is someone who is overly concerned with formal rules and details, often to the point of being annoying. A casuist is someone who uses clever but unsound reasoning to justify questionable actions. A PRETENDER is someone who claims or pretends to have a quality or position that they do not actually possess. Finally, a caviler is someone who raises trivial objections or makes frivolous criticisms.