| steadfast(stable, constant, enduring, lasting, perpetual) | |
| unchanging(stable, constant, enduring, lasting, durable) | |
| decennial | |
| nightly | |
| bulletin | |
| constant(stable, enduring, lasting, perpetual) | |
| current | |
| diurnal hours(expression, idiom) | |
| enduring(stable, constant, lasting, durable, perpetual) | |
| ephemeral | |
| ferial | |
| fixed(stable, constant, enduring, lasting, perpetual) | |
| for keeps(expression, adjective, set, stable, constant) | |
| forever and a day(expression, adjective, idiom, set, stable) | |
| in for long haul(expression, adjective, idiom, vast, ceaselessly) | |
| in for the long haul(expression, adjective, idiom, set, stable) | |
| informal | |
| journal | |
| lasting(stable, constant, vast, enduring, durable) | |
| lenten |
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| APA | Smart Define. (2015). diurnal thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/diurnal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "diurnal thesaurus" https://smartdefine.org/diurnal/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, diurnal thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/diurnal/thesaurus/synonyms>. |
| MLA | Smart Define. "diurnal thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/diurnal/thesaurus/synonyms> |