71
persistent(adjective, strong, tough, continue, strain)
66
stable(adjective, strong, secure, tough, strain)
61
lasting(adjective, calm, strong, secure, tough)
52
everlasting(adjective, strong, steady, stable, fixed)
50
firm(adjective, calm, strong, secure, tough)
48
enduring(adjective, calm, strong, secure, tough)
47
constant(adjective, calm, strong, secure, tough)
47
perpetual(adjective, strain, usual, steady, stable)
42
strong(adjective, strain, firmness, labour, hardiness)
40
durable(adjective, time, continue, strain, stable)
40
sound(adjective, strain, firmness, labour, hardiness)
39
consistent(adjective, strain, usual, steady, stable)
38
eternal(adjective, pause, steady, fixed, persistent)
38
unfluctuating(adjective, calm, strong, secure, strain)
37
fixed(verb, adjective, strong, secure, tough)
36
stiff(adjective, strain, firmness, labour, hardiness)
34
invariable(adjective, calm, strong, secure, strain)
34
steadfast(adjective, calm, strong, secure, strain)
33
unalterable(adjective, calm, strong, secure, strain)
31
stationary(adjective, moving, strain, fixed, firmness)
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APASmart Define. (2016). permanent thesaurus. Retrieved October 18, 2018, from https://smartdefine.org/permanent/thesaurus/synonyms
ChicagoSmart Define. 2016. "permanent thesaurus" https://smartdefine.org/permanent/thesaurus/synonyms (accessed October 18, 2018).
HarvardSmart Define 2016, permanent thesaurus, Smart Define, viewed 18 October, 2018, <https://smartdefine.org/permanent/thesaurus/synonyms>.
MLASmart Define. "permanent thesaurus" 26 February 2016. Web. 18 October 2018. <https://smartdefine.org/permanent/thesaurus/synonyms>