Proof against
Tough and proof against are semantically related. In some cases you can use "Tough" instead an adjective phrase "Proof against".
Tough
Tough adjective - Not easily chewed.
Proof against and tough are semantically related. Sometimes you can use "Proof against" instead an adjective "Tough".
Mutual synonyms
Both terms in one sentence
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They're also a fully justified example: Space Marines are inhumanly tough, wear armor that's proof against all but the heaviest weapons, and know what their reputation as the God-Emperor's Angels of Death does to enemy morale.
Source: Highly Conspicuous Uniform
Cite this Source
Tough and Proof against. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/proof_against/tough
Proof against & Tough. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/proof_against/tough>.
Tough or Proof against. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/proof_against/tough.
Google Ngram Viewer shows how "proof against" and "tough" have occurred on timeline