Iron
Iron adjective - Not showing weakness or uncertainty.
Usage example: he had an iron determination to succeed in on Wall Street
Tough and iron are semantically related. in inflexible topic. In some cases you can use "Tough" instead an adjective "Iron".
Tough
Tough adjective - Not easily chewed.
Mutual synonyms
How words are described
Both words in one sentence
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Aman elves think that she merely means that their claws are tough
until Luthien explains that they are made of actual iron.
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The more notable Eva Peron, on the other hand, was a hands-on, tough-as-nails Iron Lady if ever there was one.
Source: Iron Lady -
Took a Level in Badass: Adéwalé is pretty tough in the main game, but years as an Assassin have made him even more tough than he was as a young man, to the point of being Made of Iron.
Cite this Source
Tough and Iron. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/iron/tough
Iron & Tough. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/iron/tough>.
Tough or Iron. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/iron/tough.
Google Ngram Viewer shows how "iron" and "tough" have occurred on timeline