Firm
Firm adjective - Having been established and usually not subject to change.
Usage example: the selling price of the house is firm, so there'll be no dickering
Trustworthy and firm are semantically related. In some cases you can use "Trustworthy" instead an adjective "Firm".
Trustworthy
Trustworthy adjective - Worthy of one's trust.
Usage example: a trustworthy bodyguard who would never blab to the tabloids
Firm and trustworthy are semantically related. Sometimes you can use "Firm" instead an adjective "Trustworthy".
Mutual synonyms
Both words in one sentence
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These characters usually make good leaders, because though generally fun, insightful, they are still firm in decisions, trustworthy, and speak their minds.
Source: Sassy Black Woman - Turns out that delivering the package intact and on time is a test used by the security firm to see if an applicant is trustworthy.
Source: Secret Test of Character
Cite this Source
Trustworthy and Firm. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/firm/trustworthy
Firm & Trustworthy. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/firm/trustworthy>.
Trustworthy or Firm. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/firm/trustworthy.
Google Ngram Viewer shows how "firm" and "trustworthy" have occurred on timeline