Bad
caustic - Sarcastic or severely critical, often in a hurtful or biting manner; or able to burn or corrode organic tissue, typically referring to chemicals or substances.

The caustic chemical spilled onto the floor and quickly started to eat away at the floor surface.
rigmarole - A lengthy and complicated procedure that is mostly a waste of time (sometimes pronounced rigamarole)

Gino just wanted to renew his driver's license, but the rigmarole at the DMV meant he would spend hours talking to lots of people, and he ended up leaving without his license.