Synonyms|367Antonyms|96|Broader|9Narrower|15Related|697
3
untoward
2
affecting(adjective, great, excellent, superb, super)
2
apocalyptical(adjective, warn, luck, prophetical)
2
decisive
2
doomed(adjective, exciting, foreboding)
2
forbidding
2
frightful
2
heavy(bad, big, substantial, sober, serious)
2
hellfire(adjective, warn, luck, fateful)
2
horrid
2
impending(adjective, exciting, foreboding)
2
imposing
2
mind-boggling
2
monitory
2
ostentatious
2
prescient
2
pressing
2
redoubtable(adjective, fear)
2
sober(big, heavy, substantial, serious, somber)
2
somber(big, heavy, substantial, sober, serious)
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APASmart Define. (2015). portentous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/portentous/thesaurus/synonyms
ChicagoSmart Define. 2015. "portentous thesaurus" https://smartdefine.org/portentous/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, portentous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/portentous/thesaurus/synonyms>.
MLASmart Define. "portentous thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/portentous/thesaurus/synonyms>