Fast
Immutable
Immutable adjective - Not capable of changing or being changed.
Fast and immutable are semantically related. Sometimes you can use "Fast" instead an adjective "Immutable".
Nearby Word: immutability
Mutual synonyms
Cite this Source
Immutable and Fast. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/fast/immutable
Fast & Immutable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/fast/immutable>.
Immutable or Fast. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/fast/immutable.
Google Ngram Viewer shows how "fast" and "immutable" have occurred on timeline