Fast
Fast adjective - Firm in one's allegiance to someone or something.
Usage example: the two girls soon became fast and inseparable friends
Steadfast is a synonym for fast in loyal topic. In some cases you can use "Steadfast" instead an adjective "Fast", when it comes to topics like characteristic, close, fixed, continue. popular alternative
Steadfast
Steadfast adjective - Firm in one's allegiance to someone or something.
Usage example: a steadfast supporter of women's rights
Fast is a synonym for steadfast in loyal topic. You can use "Fast" instead an adjective "Steadfast", if it concerns topics such as resolute, continue. popular alternative
Nearby Words: steadfastness, steadfastly
Mutual synonyms
Both words in one sentence
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Nice Job Breaking It, Hero: Siris's steadfast belief that freeing the Worker of Secrets would save the world gets shattered fast when the Worker reveals that he just trapped Siris in the Vault, and that he has every intention of making all the other Deathless into his own personal army of conquest.
Source: Video Game / Infinity Blade
Cite this Source
Steadfast and Fast. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/fast/steadfast
Fast & Steadfast. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/fast/steadfast>.
Steadfast or Fast. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/fast/steadfast.
Google Ngram Viewer shows how "fast" and "steadfast" have occurred on timeline