Fastness and Infidelity

Opposite meaning words

Fastness noun - Adherence to something to which one is bound by a pledge or duty.

Usage example: his uncompromising fastness to the cause of freedom was beyond question

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Infidelity is an antonym for fastness.

Nearby Word: fasten

Infidelity noun - Lack of faithfulness especially to one's husband or wife.

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Fastness is an antonym for infidelity.

Nearby Word: infidel

Cite this Source

Infidelity and Fastness. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/fastness/infidelity

Fastness & Infidelity. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/fastness/infidelity>.

Infidelity or Fastness. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/fastness/infidelity.

Google Ngram Viewer shows how "fastness" and "infidelity" have occurred on timeline