100 entries under tough topic. ×
| resourceful(adjective, clear, severe, energetic) | |
| robust(adjective, strong, hard, solid) | |
| deep(adjective, clear, severe, intense) | |
| fierce(adjective, clear, severe, harsh) | |
| mule(firm, impulsive, stubborn, reckless) | |
| ornery(firm, spirited, inflexible, obstinate) | |
| rebellious(firm, inflexible, obstinate, stubborn) | |
| unreasonable(firm, inflexible, obstinate, stubborn) | |
| dense(adjective, strong, hard) | |
| feisty(adjective, energetic, forceful, strong-willed) | |
| ferric(adjective, strong, hard) | |
| ferrous(adjective, strong, hard) | |
| hard as nails(expression, adjective, idiom, strong, hard) | |
| heavy(adjective, strong, hard) | |
| insensible(adjective, strong, hard) | |
| rock hard(expression, adjective, strong, hard) | |
| steel(adjective, strong, hard) | |
| thick(adjective, strong, hard) | |
| tough inflexible(expression, strong, hard) | |
| untoward(firm, inflexible, obstinate, stubborn) |
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| APA | Smart Define. (2016). determined thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/determined/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "determined thesaurus" https://smartdefine.org/determined/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, determined thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/determined/thesaurus/synonyms>. |
| MLA | Smart Define. "determined thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/determined/thesaurus/synonyms> |