| intentive | |
| interested(adjective, attentive) | |
| lasting | |
| lively(adjective, keen, intense, energetic, vigorous) | |
| nice | |
| obdurate(adjective, tenacious) | |
| on the job(expression, idiom) | |
| painful | |
| perspicacious(adjective, fastidious) | |
| plucky(adjective, resolute, tenacious) | |
| precise(adjective, fastidious, vigilant) | |
| provident(adjective, vigilant) | |
| prudent(adjective, vigilant) | |
| quick | |
| resourceful(adjective, energetic, daring, innovative, ingenious) | |
| rigid | |
| scholarly(thoughtful, serious, reflective) | |
| single-minded | |
| spirited(adjective, energetic, lively, daring, busy) | |
| spunky(adjective, resolute, tenacious) |
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| APA | Smart Define. (2015). diligent thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/diligent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "diligent thesaurus" https://smartdefine.org/diligent/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, diligent thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/diligent/thesaurus/synonyms>. |
| MLA | Smart Define. "diligent thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/diligent/thesaurus/synonyms> |