Synonyms|199Antonyms|23|Broader|0Narrower|0Related|184
2
grim(adjective, frightening)
2
mythical(adjective, excellent, gentle, marvelous, vague)
2
ominous(adjective, frightening)
2
shadowy(adjective, excellent, gentle, marvelous, vague)
2
spectral(adjective, ghostly)
1
apparitional(adjective, ghostly)
1
bizarre
1
dark
1
demonic(adjective, ghostly)
1
direful(adjective, frightening)
1
dismaying
1
fanciful(adjective, excellent, gentle, marvelous, vague)
1
fantastic(adjective, excellent, gentle, marvelous, vague)
1
fearsome(adjective, frightening)
1
grotesque
1
hellish(adjective, frightening)
1
moony(adjective, gentle, marvelous, dreamy)
1
morbid(adjective, frightening)
1
outlandish
1
petrifying(adjective, frightening)
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APASmart Define. (2013). nightmarish thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/nightmarish/thesaurus/synonyms
ChicagoSmart Define. 2013. "nightmarish thesaurus" https://smartdefine.org/nightmarish/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2013, nightmarish thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/nightmarish/thesaurus/synonyms>.
MLASmart Define. "nightmarish thesaurus" 28 June 2013. Web. 29 September 2026. <https://smartdefine.org/nightmarish/thesaurus/synonyms>