nightmarish

/ˈnaɪtˌmɛrɪʃ/
adjective
  1. Extremely frightening, unpleasant, or disturbing, like a nightmare.
    • The abandoned hospital had a nightmarish atmosphere.
    • They lived through a nightmarish ordeal during the storm.
    • The movie's special effects created a nightmarish landscape.
Antonyms
What does "nightmarish" mean? | whatsthatwordmean | whatsthatwordmean