Synonym word of nightmarish:

alarming, awful, chilling, creepy, dire, direful, disquieting, dreadful, eerie, fearful, fearsome, ghastly, ghoulish, grim, grisly, hair-raising, hellish, horrible, horrid, horrifying, macabre, morbid, ominous, petrifying, scary, spooky, terrible, terrifying, traumatic, unnerving


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