Lawyers can be accused of many things, but now risk being labelled "a pettifogger".

Presiding over President Trump's impeachment trial, Chief Justice of the Supreme Court, John Roberts used the archiac term "pettifogging" when reminding impeachment managers and the President's lawyers about the expected levels of behaviour.

Dating back to the 16th century to "pettifog" means to "quibble over insignificant details".  One translation of a "pettifogger" is an inferior legal practitioner, especially one who deals with petty cases or employs dubious practices.  

Given the state of American politics, it is perhaps not surprising the word is experiencing a renaissance.  For fellow lawyers, it is perhaps a polite insult to use at an opportune moment.