88 entries under horrible topic. ×

6
threatening(adjective, tough, severe, unpleasant, important)
5
dismaying(adjective, difficult, overwhelming, terrifying)
5
troublesome(adjective, hard, tough, severe, evil)
4
fell(adjective, tough, severe, unpleasant, important)
4
forbidding(adjective, appearance, tough, unpleasant, terrible)
4
impregnable(adjective, dreadful, terrifying)
4
ugly(adjective, bad, hard, tough, severe)
3
grave(adjective, tough, severe, difficult, unpleasant)
3
mean(adjective, bad, severe, rough, nasty)
3
wicked(adjective, bad, nasty, delicate, unpleasant)
2
cantankerous(adjective, hard, evil, rough, nasty)
2
distressing(adjective, bad, tough, severe, rough)
2
grievous(adjective, tough, severe, difficult, unpleasant)
2
nasty(adjective, bad, hard, rough, difficult)
2
treacherous(adjective, bad, hard, evil, rough)
2
violent(adjective, hard, severe, rough, difficult)
1
atrocious(bad, awful, terrible, shocking)
1
despicable(adjective, hard, evil, rough, nasty)
1
dirty(adjective, hard, rough, nasty, rude)
1
disagreeable(adjective, hard, evil, rough, nasty)
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APASmart Define. (2015). formidable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/formidable/thesaurus/synonyms
ChicagoSmart Define. 2015. "formidable thesaurus" https://smartdefine.org/formidable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, formidable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/formidable/thesaurus/synonyms>.
MLASmart Define. "formidable thesaurus" 17 July 2015. Web. 24 September 2026. <https://smartdefine.org/formidable/thesaurus/synonyms>