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
Reliable is a synonym for firm in character trait topic. In some cases you can use "Reliable" instead an adjective "Firm", when it comes to topics like constant.
Reliable
Reliable adjective - Worthy of one's trust.
Usage example: I need a reliable car that's not going to break down constantly
Firm is a synonym for reliable in character trait topic. Sometimes you can use "Firm" instead an adjective "Reliable", if it concerns topics such as steadfast, trustworthy.
Mutual synonyms
Both words in one sentence
- As one of the few cops in the precinct not to be on Wilson Fisk's payroll, he's also the one reliable cop the firm turns Hoffman over to when he sells Fisk out.
Source: Friend on the Force -
Reiner is a firm believer in this theory, and as a result is deeply admired by the others as a reliable and heroic "big brother".
Source: Good Feels Good
Cite this Source
Reliable and Firm. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/firm/reliable
Firm & Reliable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/firm/reliable>.
Reliable or Firm. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/firm/reliable.
Google Ngram Viewer shows how "firm" and "reliable" have occurred on timeline