| scheming | |
| semihard | |
| serious | |
| set | |
| shameful | |
| shrewd | |
| solid | |
| stony | |
| ticklish | |
| titanic | |
| touchy | |
| tough | |
| tricky | |
| troublesome | |
| trying | |
| tumid | |
| unfortunately(adverb, bitterly, grievously, dolefully, dolorously) | |
| adamant(adjective, firmness, hardness, solidity, sturdiness) | |
| allergic | |
| avoiding contact |
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| APA | Smart Define. (2016). hard thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/hard/thesaurus/related |
| Chicago | Smart Define. 2016. "hard thesaurus" https://smartdefine.org/hard/thesaurus/related (accessed September 24, 2026). |
| Harvard | Smart Define 2016, hard thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/hard/thesaurus/related>. |
| MLA | Smart Define. "hard thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/hard/thesaurus/related> |