173 entries under persistent topic. ×
| endless(adjective, determined, steady, resolute) | |
| equable(adjective, calm, strong, secure, solid) | |
| froward(adjective, obstinate, insistent, dogged) | |
| hard as nails(expression, adjective, idiom, set, strong) | |
| hardboiled(adjective, tough, serious, resolute) | |
| homogeneous(adjective, dull, steady, stable, regular) | |
| incessant(adjective, strong, determined, steady, resolute) | |
| insurgent(adjective, obstinate, insistent, dogged) | |
| interminable(adjective, determined, steady, resolute) | |
| like the Rock of Gibralter(expression, adjective, idiom, steady, stable) | |
| mean business(expression, adjective, intense, deliberate, determined) | |
| monochrome(adjective, dull, steady, stable, regular) | |
| monophonic(adjective, dull, steady, stable, regular) | |
| monotonous(adjective, dull, steady, stable, regular) | |
| narrow-minded(adjective, obstinate, insistent, dogged) | |
| nonstop(adjective, dull, steady, stable, regular) | |
| obsessive(adjective, obstinate, insistent, dogged) | |
| of a piece(expression, adjective, idiom, steady, stable) | |
| regularized(adjective, dull, steady, stable, regular) | |
| solid as rock(expression, adjective, idiom, steady, stable) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |