Synonyms|127Antonyms|52|Broader|0Narrower|0Related|569
2
stable(adjective, sacrosanct)
2
stiff(adjective, strong, hard, severe, firm)
2
stout
2
toughened(adjective, strong, tough)
1
persistent
1
atomic
1
cast-iron
1
definite(adjective, severe, firm, harsh, solid)
1
fixed
1
incorruptible(adjective, strong, tough)
1
inflexible(adjective, strong, hard, severe, firm)
1
invulnerable(adjective, strong, tough)
1
long-lasting
1
perdurable(adjective, strong, tough)
1
perennial
1
resilient(adjective, strong, hard, solid, stiff)
1
robust
1
sacred
1
set(adjective, severe, firm, harsh, solid)
1
sound
For more, visit Unbreakable on Power Thesaurus
10 years ago|18k views|share |citing 
APASmart Define. (2016). unbreakable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, unbreakable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>.
MLASmart Define. "unbreakable thesaurus" 5 January 2016. Web. 24 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms>