24
fateful(adjective, importance, significant, valuable, black)
22
serious(adjective, importance, valuable, main, notable)
19
inauspicious(adjective, awful, fear, black, exciting)
19
momentous(adjective, importance, valuable, main, notable)
18
consequential(adjective, importance, valuable, main, notable)
17
ominous(adjective, exciting, foreboding, warn, luck)
17
remarkable(adjective, extraordinary, importance, valuable, main)
17
weighty(adjective, importance, important, serious, valuable)
16
grave(adjective, importance, valuable, main, notable)
16
significant(adjective, importance, valuable, main, notable)
15
important(adjective, importance, valuable, main, exciting)
15
solemn(adjective, quiet, great, excellent, importance)
13
amazing(adjective, extraordinary, astonishment, exciting, foreboding)
13
foreboding(adjective, black, ominous, baleful, bodeful)
12
dire(adjective, terrible, fear, black, warn)
12
pompous(adjective, importance, main, arrogant, extremely significant)
12
sinister(adjective, nasty, black, menacing, baleful)
11
threatening(adjective, exciting, foreboding, ominous)
11
gloomy(adjective, awful, fear, black, horror)
11
impressive(adjective, importance, valuable, main, notable)
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APASmart Define. (2015). portentous thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/portentous/thesaurus/synonyms
ChicagoSmart Define. 2015. "portentous thesaurus" https://smartdefine.org/portentous/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, portentous thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/portentous/thesaurus/synonyms>.
MLASmart Define. "portentous thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/portentous/thesaurus/synonyms>