Iron
Mutual synonyms
Both words in one sentence
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The Zulus, despite being equipped with iron spears and rawhide shields, were known for their tactical cunning, their rigorous training, and their suicidal bravery.
Source: Rock Beats Laser - Shaolin monks practice a rigorous regimen known as "Iron Body Technique", allowing wooden clubs to be broken across their bodies, limbs and heads with little effect, as well as great resistance to piercing weapons.
Source: Made Of Iron / Real Life
Cite this Source
Rigorous and Iron. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/iron/rigorous
Iron & Rigorous. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/iron/rigorous>.
Rigorous or Iron. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/iron/rigorous.
Google Ngram Viewer shows how "iron" and "rigorous" have occurred on timeline