- Definitions|1
- Thesaurus|406
- Abbreviations|0
| soothing(excellent, gentle, marvelous, vague, dreamy) | |
| speculative(excellent, gentle, marvelous, vague, dreamy) | |
| sublime(adjective, extraordinary, unreasonable, inappropriate, absurd) | |
| superhuman(adjective, extraordinary, unreasonable, inappropriate, absurd) | |
| tremendous | |
| uncanny | |
| ungodly(adjective, extraordinary, unreasonable, inappropriate, absurd) | |
| unholy(adjective, extraordinary, unreasonable, inappropriate, absurd) | |
| unpleasant | |
| unreasonable(adjective, extraordinary, inappropriate, ridiculous, absurd) | |
| unsubstantial(excellent, gentle, marvelous, vague, dreamy) | |
| utopian(excellent, gentle, marvelous, vague, dreamy) | |
| vague(excellent, gentle, marvelous, dreamy, faraway) | |
| vinegarish | |
| visionary(excellent, gentle, marvelous, vague, dreamy) | |
| whimsical(excellent, gentle, marvelous, vague, dreamy) | |
| wistful | |
| woolgathering(excellent, gentle, marvelous, dreamy) | |
| worrisome |
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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> |