Synonyms|367Antonyms|96|Broader|9Narrower|15Related|697

181 entries under adjective topic. ×

7
challenging(importance, valuable, main, notable)
7
constitutive(importance, valuable, main, notable)
7
disastrous(awful, fear, black, horror)
7
donnish(importance, valuable, main, notable)
7
essential(importance, valuable, main, notable)
7
far reaching(importance, valuable, main, notable)
7
grandiloquent
7
great(importance, valuable, main, notable)
7
high-up(importance, valuable, main, notable)
7
ill-fated(exciting, foreboding, ominous)
7
ill-omened(awful, fear, black, horror)
7
influential(importance, valuable, main, notable)
7
key(importance, valuable, main, notable)
7
key-note(importance, valuable, main, notable)
7
newsworthy(importance, valuable, main, notable)
7
outstanding(importance, valuable, main, notable)
7
pretentious(importance, main, extremely significant)
7
prophetic(exciting, foreboding, ominous)
7
purposeful(importance, valuable, main, notable)
7
responsible(importance, valuable, main, notable)
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ChicagoSmart Define. 2015. "portentous thesaurus" https://smartdefine.org/portentous/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, portentous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/portentous/thesaurus/synonyms>.
MLASmart Define. "portentous thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/portentous/thesaurus/synonyms>