137 entries under tough topic. ×
| crucial(problematic, trying) | |
| difficile(problematic, trying) | |
| easier said than done(expression, idiom, problematic, trying) | |
| effortful(problematic, trying) | |
| fastidious(grim, problematic, trying, troublesome) | |
| fine-grained(hard, solid, rigid, inflexible) | |
| finicky(problematic, trying) | |
| fussy(problematic, trying) | |
| galling(problematic, trying) | |
| gargantuan(problematic, trying) | |
| grueling(problematic, trying) | |
| hard-won(problematic, trying) | |
| hard to please(expression, idiom, grim, problematic) | |
| herculean(problematic, trying) | |
| immense(problematic, trying) | |
| impolite(grim, problematic, trying, troublesome) | |
| labored(problematic, trying) | |
| laborious(problematic, trying, disorderly, unruly) | |
| no picnic(expression, problematic, trying) | |
| nonporous(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> |