#obstructionist__obstructor__obstructer__resister__thwarter  someone who systematically obstructs some action that others want to take
  supertype:  #disputant  a person who disputes; who is good at or enjoys controversy
  subtype:  #naysayer  someone with an aggressively negative attitude
  subtype:  #stonewaller  one who stonewalls or refuses to answer or cooperate

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