pettifogger

noun2

1. •
   Someone who quibbles over trivia, and raises petty, annoying objections and sophistry.

   • Hence the cunning measure of appointing as ambassador some political pettifogger skilled in delays, sophisms, and misapprehensions, and dexterous in the art of baffling argument. — 1809
2. •
   An unscrupulous or unethical lawyer, especially one of lesser skill.

   • "An inn, or a tavern . . . these are places where greasy citizens take pipe and pot, where the knavish pettifoggers of the law spunge on their most unhappy victims. — 1822