137 entries under tough topic. ×
| solid(adjective, hard, firm, tense) | |
| solidified(adjective, hard, firm, solid) | |
| thick(adjective, set, hard, firm) | |
| tiresome(grim, problematic, trying, troublesome) | |
| titanic(problematic, trying) | |
| unbendable(adjective, firm, unreasonable, grim) | |
| unpliable(difficult, unpleasant, wild, awkward) | |
| unreasonable(firm, grim, inflexible, obstinate) | |
| ambitious(problematic, trying) | |
| arduous(problematic, trying, disorderly, unruly) | |
| backbreaker(problematic, trying) | |
| bearish(grim, problematic, trying, troublesome) | |
| boorish(grim, problematic, trying, troublesome) | |
| bothersome(problematic, trying, disorderly, unruly) | |
| burdensome(problematic, trying, disorderly, unruly) | |
| close(hard, solid, rigid, inflexible) | |
| close-grained(hard, solid, rigid, inflexible) | |
| compressed(hard, solid, rigid, inflexible) | |
| concentrated(hard, solid, rigid, inflexible) | |
| condensed(hard, solid, rigid, inflexible) |
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| APA | Smart Define. (2015). refractory thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/refractory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "refractory thesaurus" https://smartdefine.org/refractory/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, refractory thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/refractory/thesaurus/synonyms>. |
| MLA | Smart Define. "refractory thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/refractory/thesaurus/synonyms> |