| stern(adjective, resolute) | |
| stickler(adjective, thorough, meticulous, painstaking) | |
| stiff(adjective, tenacious) | |
| stony(adjective, tenacious) | |
| strong-minded(adjective, resolute) | |
| tied up(expression, active, absorbed, occupied, working) | |
| uncompromising(adjective, resolute) | |
| undivided(adjective, whole) | |
| unshakeable(adjective, resolute) | |
| unsleeping | |
| unwearying | |
| vehement(adjective, strong, passionate, powerful, deep) | |
| weariless | |
| willing(adjective, resolute) | |
| with a customer(expression, idiom, active, occupied, working) | |
| workaday(adjective, activity, regular, serious, practical) | |
| on the go(expression, idiom, keen, energetic, lively) | |
| absolute | |
| abstract application(expression, idiom, attention) | |
| abstract attention(expression, idiom, attention) |
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| APA | Smart Define. (2015). diligent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/diligent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "diligent thesaurus" https://smartdefine.org/diligent/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, diligent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/diligent/thesaurus/synonyms>. |
| MLA | Smart Define. "diligent thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/diligent/thesaurus/synonyms> |