Synonyms|131Antonyms|64|Broader|0Narrower|0Related|90
1
unalterable
1
unbreakable
1
ungiving
1
unmoved
1
unrelenting
1
unyielding
1
vigorous
0
abiding(inflexible, intent, hard-and-fast)
0
adamantine
0
agreed(inflexible, intent, hard-and-fast)
0
aluminium
0
aluminum
0
arranged(inflexible, intent, hard-and-fast)
0
authentic
0
barium
0
bauxite
0
brass
0
brassbound
0
brazen
0
bronze
For more, visit Cast-iron on Power Thesaurus
11 years ago|1.5k views|share |citing 
APASmart Define. (2015). cast-iron thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/cast-iron/thesaurus/synonyms
ChicagoSmart Define. 2015. "cast-iron thesaurus" https://smartdefine.org/cast-iron/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, cast-iron thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/cast-iron/thesaurus/synonyms>.
MLASmart Define. "cast-iron thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/cast-iron/thesaurus/synonyms>