Firm
Firm adjective - Having a consistency that does not easily yield to pressure.
Usage example: cold butter that was too firm to spread
Substantial is a synonym for firm in inflexible topic. In some cases you can use "Substantial" instead an adjective "Firm", when it comes to topics like stable, continue, strong.
Mutual synonyms
Both words in one sentence
- Repeating the name of the firm three times summons them, and they're former practitioners, they signed themselves to the firm in order to clear substantial karmic debt and can no longer use their powers outside of the firms interests.
Source: Literature / Pact
Cite this Source
Substantial and Firm. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/firm/substantial
Firm & Substantial. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/firm/substantial>.
Substantial or Firm. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/firm/substantial.
Google Ngram Viewer shows how "firm" and "substantial" have occurred on timeline