- Definitions|2
- Thesaurus|1.1k
- Abbreviations|0
| critical(adjective, bad, big, heavy, significant) | |
| direful(adjective, fear, black, warn, luck) | |
| marvelous | |
| unpromising | |
| awe-inspiring(adjective, fear) | |
| baneful(adjective, warn, luck) | |
| calamitous | |
| exceptional | |
| fabulous | |
| fatal | |
| fraught(adjective, momentous) | |
| incredible | |
| indescribable | |
| marvellous(adjective, great, excellent, superb, super) | |
| oracular(adjective, black, baleful, bodeful, prophetic) | |
| pontifical | |
| unfortunate | |
| dismal(adjective, black, baleful, bodeful) | |
| dreadful(adjective, fear) | |
| eldritch(adjective, awful, fear, black, horror) |
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| APA | Smart Define. (2015). portentous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/portentous/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "portentous thesaurus" https://smartdefine.org/portentous/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, portentous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/portentous/thesaurus/synonyms>. |
| MLA | Smart Define. "portentous thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/portentous/thesaurus/synonyms> |