918 entries under adjective topic. ×
| disturbing(hard, difficult, complex) | |
| esoteric(hard, difficult, complex) | |
| grinding(hard, difficult, harsh, cruel) | |
| hard-nosed(strong, hard, tough, severe) | |
| heavy(strong, hard, great, tough) | |
| intricate(hard, difficult, complex, awkward) | |
| knotty(hard, difficult, complex, awkward) | |
| ponderous(hard, difficult, complex) | |
| rough(bad, strong, hard, tough) | |
| rugged(strong, hard, tough, difficult) | |
| sensitive(hard, difficult, complex) | |
| sophisticated(hard, difficult, complex) | |
| sticky(hard, difficult, complex, awkward) | |
| toilful(hard, difficult, complex, awkward) | |
| toilsome(hard, difficult, harsh, cruel) | |
| vital(great, severe, importance, big) | |
| hefty(hard, difficult, complex) | |
| messy(hard, difficult, unpleasant, complex) | |
| taxing(hard, difficult, complex) | |
| tricky(hard, difficult, complex, awkward) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |