- Definitions|2
- Thesaurus|1.9k
- Abbreviations|0
| unfavourable | |
| vile(adjective, negative emotions) | |
| awful(adjective, mean, nasty, offensive, foul) | |
| bad to the bone | |
| base | |
| cataclysmic(adjective, dreadful, harmful, injurious, damaging) | |
| counterproductive | |
| deathly | |
| disserviceable | |
| dreadful | |
| hateful(adjective, mean, bad, evil, nasty) | |
| iniquitous(adjective, bad, corrupt, immoral, distressing) | |
| internecine(adjective, violent, cruel, harmful, injurious) | |
| maleficent(adjective, bad, hurtful) | |
| mephitic | |
| nasty(adjective, mean, evil, cruel, wicked) | |
| rotten | |
| sinful(adjective, bad, evil, nasty, harsh) | |
| spiteful(adjective, mean, bad, evil, nasty) | |
| terrible |
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| APA | Smart Define. (2016). pernicious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/pernicious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "pernicious thesaurus" https://smartdefine.org/pernicious/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, pernicious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/pernicious/thesaurus/synonyms>. |
| MLA | Smart Define. "pernicious thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/pernicious/thesaurus/synonyms> |