50 entries under calm topic. ×

12
durable(adjective, strong, tough, continue)
12
lasting(adjective, strong, tough, continue)
10
enduring(adjective, strong, continue, substantial)
8
permanent(adjective, strong, continue, sturdy)
7
abiding(adjective, strong, continue, substantial)
5
constant(adjective, strong, substantial, stable)
3
tough(adjective, strong, solid, steady)
2
immutable(strong, solid, substantial, constant)
2
steadfast(strong, solid, steady, stable)
2
steady(strong, even, constant, unchanging)
1
anchored(strong, solid, steady, substantial)
1
balanced(strong, solid, steady, substantial)
1
brick-wall(strong, solid, steady, substantial)
1
deep-rooted(strong, solid, steady, substantial)
1
equable(strong, solid, steady, substantial)
1
even(strong, solid, steady, substantial)
1
fast(strong, tough, solid, substantial)
1
firm(strong, tough, steady, even)
1
fixed resistant(expression, strong, solid, substantial)
1
invariable(strong, solid, steady, substantial)
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APASmart Define. (2016). perdurable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/perdurable/thesaurus/synonyms
ChicagoSmart Define. 2016. "perdurable thesaurus" https://smartdefine.org/perdurable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, perdurable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/perdurable/thesaurus/synonyms>.
MLASmart Define. "perdurable thesaurus" 3 March 2016. Web. 22 September 2026. <https://smartdefine.org/perdurable/thesaurus/synonyms>