137 entries under tough topic. ×
| trying(difficulty, grim, problematic, troublesome) | |
| unshakable(adjective, firm, unreasonable, grim) | |
| challenging(adjective, problematic, trying) | |
| concrete(hard, solid, rigid, inflexible) | |
| congealed(adjective, hard, firm, solid) | |
| grim(firm, unreasonable, stubborn, problematic) | |
| hang tough(expression, difficult, wild, awkward) | |
| hardened(adjective, hard, firm, solid) | |
| hardheaded(firm, unreasonable, grim, inflexible) | |
| heavy(hard, solid, rigid, inflexible) | |
| impervious(hard, solid, rigid, inflexible) | |
| incurable(difficult, wild, awkward, obstinate) | |
| inelastic(adjective, hard, firm, solid) | |
| insoluble(difficult, wild, awkward, obstinate) | |
| irritating(unpleasant, adverse, problematic, unfortunate) | |
| jelled(adjective, hard, firm, solid) | |
| locked in(expression, difficult, determined, awkward) | |
| mule(firm, determined, unreasonable, grim) | |
| pat(difficult, wild, awkward, obstinate) | |
| persevering(adjective, firm, unreasonable, grim) |
For more, visit
Refractory on
Power Thesaurus
| APA | Smart Define. (2015). refractory thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/refractory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "refractory thesaurus" https://smartdefine.org/refractory/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, refractory thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/refractory/thesaurus/synonyms>. |
| MLA | Smart Define. "refractory thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/refractory/thesaurus/synonyms> |