Immutable
Immutable adjective - Not capable of changing or being changed.
Tough nut and immutable are semantically related In some cases you can use "Tough nut" instead an adjective "Immutable".
Nearby Word: immutability
Tough nut
Mutual synonyms
Related pairs
Cite this Source
Tough nut and Immutable. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/immutable/tough_nut
Immutable & Tough nut. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/immutable/tough_nut>.
Tough nut or Immutable. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/immutable/tough_nut.
Google Ngram Viewer shows how "immutable" and "tough nut" have occurred on timeline