| hardheaded | |
| impenetrable | |
| impossible | |
| jumpy | |
| killer | |
| more difficult | |
| nervy | |
| opaque(adjective, hard) | |
| painstaking(adjective, thorough, meticulous) | |
| particular | |
| persnickety | |
| perturbed | |
| poor | |
| precarious | |
| restrictive | |
| rigid | |
| rocky | |
| ruthless(calm, gentle, merciful) | |
| serious | |
| sheer |
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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> |