Synonyms|330Antonyms|5|Broader|3Narrower|0Related|149
2
strong
2
sure(adjective, set, certain, fixed, rigid)
2
unassailable(adjective, set, certain, unquestionable, indisputable)
2
unchangeable(adjective, flexible)
2
unrelenting
1
abiding(adjective, fixed, rigid)
1
accurate(set, certain, unquestionable, indisputable, unassailable)
1
acrimonious(adjective, severe, harsh, stiff, rigid)
1
active
1
all-business(adjective, character, behavior, pedant)
1
apodictic(set, certain, unquestionable, indisputable, unassailable)
1
appointed(adjective, firm, determined, usual, regular)
1
armed
1
armor
1
armor-plated
1
armor plated(expression, idiom, covering)
1
armour-plated
1
armoured
1
arranged(adjective, firm, determined, usual, regular)
1
assiduous
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APASmart Define. (2015). ironclad thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/ironclad/thesaurus/synonyms
ChicagoSmart Define. 2015. "ironclad thesaurus" https://smartdefine.org/ironclad/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, ironclad thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/ironclad/thesaurus/synonyms>.
MLASmart Define. "ironclad thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/ironclad/thesaurus/synonyms>