Vexatious Litigation or Unfounded Litigation

Synonyms for vexatious include: afflicting, aggravating, annoying, burdensome, disagreeable, disappointing, disturbing, exasperating, irritating, and irksome.

causing lot of vexatious

it means you dont take no as an option....

When I entered the room and found her sitting in the chair, hugging her knees to her chest and rocking back and forth with a deep frown on her face, it was clear that she was dealing with a very vexatious problem.