Firm belief
Proof and firm belief are semantically related. In some cases you can use "Proof" instead a noun phrase "Firm belief".
Proof
Proof noun - Something presented in support of the truth or accuracy of a claim.
Firm belief and proof are semantically related. Sometimes you can use "Firm belief" instead a noun "Proof".
Both terms in one sentence
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Ellie Arroway spends the first quarter of the film demonstrating firm belief in the existence of alien life, even at the detriment of her career, despite the fact there is no empirical proof, the exact thing she stated as the reason she doesn't believe in a god.
Source: Film / Contact
Cite this Source
Proof and Firm belief. (2016). Retrieved 2026, August 09, from https://thesaurus.plus/related/firm_belief/proof
Firm belief & Proof. N.p., 2016. Web. 09 Aug. 2026. <https://thesaurus.plus/related/firm_belief/proof>.
Proof or Firm belief. 2016. Accessed August 09, 2026. https://thesaurus.plus/related/firm_belief/proof.
Google Ngram Viewer shows how "firm belief" and "proof" have occurred on timeline