- Definitions|1
- Thesaurus|483
- Abbreviations|0
| impliable | |
| imprudent(determined, impulsive, stubborn, reckless, impetuous) | |
| incontinent(coarse, vulgar, indecent, naughty, lewd) | |
| incorruptible(adjective, close, correct, firm, honest) | |
| indecent(offensive, dirty, coarse, vulgar, naughty) | |
| indissoluble | |
| inelastic | |
| inflamed | |
| intractable(firm, determined, resolute, impulsive, stubborn) | |
| iron | |
| irreconcilable | |
| lascivious(adjective, offensive, dirty, coarse, vulgar) | |
| lasting | |
| lecherous(coarse, vulgar, indecent, naughty, lewd) | |
| lengthy | |
| lewd(adjective, offensive, dirty, vulgar, indecent) | |
| libertine(coarse, vulgar, indecent, naughty, lewd) | |
| libidinous(coarse, vulgar, indecent, naughty, lewd) | |
| licentious(coarse, vulgar, indecent, lewd, lustful) | |
| liege(adjective, faithful) |
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| APA | Smart Define. (2016). hard-core thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/hard-core/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "hard-core thesaurus" https://smartdefine.org/hard-core/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, hard-core thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/hard-core/thesaurus/synonyms>. |
| MLA | Smart Define. "hard-core thesaurus" 28 March 2016. Web. 23 September 2026. <https://smartdefine.org/hard-core/thesaurus/synonyms> |