The nine-letter word meaning outstandingly bad is "atrocious." It describes something that is extremely bad or of very poor quality, often in a shocking or appalling way. This term can apply to various contexts, including behavior, performances, or conditions.
What is a nine letter word meaning very tidy
fleetness
maternity
lucrative
therefore
ferocious
dauntless
niggardly
evaporate
How about "exonerate".
Deviation, exception
Bookcases