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Portentous has 65 synonyms. The top synonyms for portentous are dire, fatal, grave, heavy, boding, dreary, gloomy, somber and 57 more. Another word for portentous is dire. Browse the full list below.
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| Random | DefinitionA common synonym for portentous is dire. Other synonyms include fatal, grave, heavy, boding.
Portentous has 65 synonyms listed on Thesaurasize.
(adj): Ominous; portending evil; marvelous; prodigious; wonderful
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