17 entries under tough topic. ×

30
unbreakable(adjective, strong, firm, rigid)
22
permanent(adjective, strong, sturdy, constant)
15
durable(adjective, strong, stable, sturdy)
14
enduring(adjective, stable, sturdy, constant)
14
lasting(adjective, strong, stable, sturdy)
12
fixed(adjective, stable, sturdy, constant)
10
abiding(adjective, stable, sturdy, constant)
10
constant(adjective, stable, sturdy, enduring)
8
perdurable(adjective, strong, stable, constant)
5
long-lasting(adjective, stable, sturdy, constant)
4
firm(adjective, strong, sturdy, permanent)
3
persistent(adjective, stable, moral, sturdy)
3
stable(adjective, sturdy, constant, enduring)
3
strong(adjective, sturdy, permanent, untouchable)
1
perduring(stable, sturdy, constant, enduring)
1
reliable(adjective, moral, sturdy, principled)
0
resilient(adjective, strong, sturdy, permanent)
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APASmart Define. (2015). indestructible thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/indestructible/thesaurus/synonyms
ChicagoSmart Define. 2015. "indestructible thesaurus" https://smartdefine.org/indestructible/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, indestructible thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/indestructible/thesaurus/synonyms>.
MLASmart Define. "indestructible thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/indestructible/thesaurus/synonyms>