| nasty(calm, good, gentle) | |
| obnoxious | |
| prickly | |
| problematic | |
| problematical | |
| rapidly | |
| recondite | |
| rigorous(adjective, severe, exact) | |
| rough(adjective, soft, flat) | |
| scarce | |
| self-motivated | |
| speedily | |
| spooky | |
| stern | |
| stiff(adjective, difficult) | |
| strong | |
| stubborn | |
| tall | |
| taxing | |
| thorny(adjective, difficult, problematic) |
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| APA | Smart Define. (2016). easy thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/easy/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "easy thesaurus" https://smartdefine.org/easy/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, easy thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/easy/thesaurus/antonyms>. |
| MLA | Smart Define. "easy thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/easy/thesaurus/antonyms> |