Firm
Firm adjective - Not showing weakness or uncertainty.
Usage example: a friendly fellow with a ready smile and a firm handshake
Secure is a synonym for firm in stable topic. In some cases you can use "Secure" instead the word "Firm" as an adjective or a verb, when it comes to topics like quality, property, state, continue.
Secure
Secure adjective - Worthy of one's trust.
Usage example: a fund that should provide them with a secure income in their retirement
Firm is a synonym for secure in characteristic topic. You can use "Firm" instead the word "Secure" as an adjective or a verb, if it concerns topics such as property, state, fast, tight.
Mutual synonyms
Both words in one sentence
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When Pignon is about to get fired, his new neighbour advises him to let the firm "accidentally" think he's gay, so he could use discrimination charges to secure his position.
Source: Loving Bully -
Bert Cooper is the Prophet, satisfied with his life (except for that operation), wanting only to secure his legacy in the form of leaving a healthy firm.
Source: The Three Faces of Adam -
Cooper is the Prophet, satisfied with his life (except for that operation), wanting only to secure his legacy in the form of leaving a healthy firm.
Source: Series / Mad Men
Cite this Source
Secure and Firm. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/firm/secure
Firm & Secure. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/firm/secure>.
Secure or Firm. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/firm/secure.
Google Ngram Viewer shows how "firm" and "secure" have occurred on timeline