343 entries under adjective topic. ×
| alert(keen, intense, energetic, lively) | |
| determined(resolute, tenacious) | |
| eager(strong, keen, intense, energetic) | |
| faithful(certain, careful, resolute, reliable) | |
| intense(strong, complete, severe, passionate) | |
| observant(attentive, vigilant) | |
| occupied(active, absorbed, working, engaged) | |
| steady | |
| unwavering | |
| enduring | |
| expeditious(regular, quick, serious, competent) | |
| fastidious(precise, thorough, meticulous, fastidious) | |
| finicky(thorough, meticulous, fastidious, painstaking) | |
| hard(strong, difficult, powerful, tedious) | |
| indomitable(resolute, tenacious) | |
| insistent(resolute, tenacious) | |
| loyal | |
| mindful(attentive, vigilant) | |
| obstinate | |
| operose(work, tedious, labour, persevering) |
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| APA | Smart Define. (2015). diligent thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/diligent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "diligent thesaurus" https://smartdefine.org/diligent/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, diligent thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/diligent/thesaurus/synonyms>. |
| MLA | Smart Define. "diligent thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/diligent/thesaurus/synonyms> |