36 entries under adjective topic. ×
| courageous | |
| elevated | |
| eminent | |
| endless | |
| everlasting | |
| exacting | |
| exalted | |
| grim | |
| intense | |
| lofty | |
| never-ending | |
| over-long | |
| rigorous | |
| serious | |
| severe | |
| strict |
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| APA | Smart Define. (2015). marathon thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/marathon/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "marathon thesaurus" https://smartdefine.org/marathon/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, marathon thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/marathon/thesaurus/synonyms>. |
| MLA | Smart Define. "marathon thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/marathon/thesaurus/synonyms> |