222 entries under tough topic. ×
| active(adjective, strong, sound, fit) | |
| cantankerous(adjective, persistent, obstinate, stubborn) | |
| cussed(adjective, persistent, obstinate, stubborn) | |
| dour(adjective, severe, harsh, cruel) | |
| hard-boiled(adjective, mean, strong, hard) | |
| hard-core(adjective, close, strong, hard) | |
| hard-hearted(adjective, mean, hard, harsh) | |
| hard-shell(adjective, strong, hard, severe) | |
| long-lasting(adjective, familiar, sturdy, established) | |
| opinionated(adjective, determined, unreasonable, fixed) | |
| persisting(adjective, strong, determined, steady) | |
| perverse(adjective, mean, hard, determined) | |
| puritanical(adjective, severe, harsh, rigid) | |
| rebellious(adjective, unreasonable, inflexible, obstinate) | |
| rough(adjective, strong, hard, severe) | |
| steel(verb, adjective, close, set, fix) | |
| able(adjective, strong, sound, easy) | |
| all right(expression, strong, fit, fresh) | |
| astringent(adjective, strong, hard, severe) | |
| athletic(strong, sound, fit, solid) |
For more, visit
Firm on
Power Thesaurus
| APA | Smart Define. (2016). firm thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 29 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |