- Definitions|1
- Thesaurus|406
- Abbreviations|0
152 entries under adjective topic. ×
| evil | |
| excruciating | |
| extreme | |
| fearful | |
| frightening(nasty, awful, terrible, unreasonable) | |
| grewsome | |
| harrowing | |
| harsh | |
| horrific | |
| insufferable | |
| insupportable | |
| intense | |
| intolerable | |
| loathsome | |
| nasty | |
| nightmare(terrible, frightening, traumatic, terrifying) | |
| noxious | |
| obnoxious | |
| odious | |
| offensive |
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| APA | Smart Define. (2013). nightmarish thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/nightmarish/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "nightmarish thesaurus" https://smartdefine.org/nightmarish/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2013, nightmarish thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/nightmarish/thesaurus/synonyms>. |
| MLA | Smart Define. "nightmarish thesaurus" 28 June 2013. Web. 29 September 2026. <https://smartdefine.org/nightmarish/thesaurus/synonyms> |