276 entries under adjective topic. ×

63
persistent(strain, certain, stable, regular)
54
consistent(change, strain, certain, ordinary)
54
stable(quiet, soft, gentle, strain)
44
firm(calm, strong, secure, strain)
43
constant(calm, change, strong, secure)
41
strong(strain, firmness, labour, hardiness)
40
unfluctuating(calm, strong, secure, strain)
37
hard(strain, firmness, labour, hardiness)
37
sound(strain, firmness, labour, hardiness)
37
steady(calm, quiet, strong, secure)
37
stiff(strain, firmness, labour, hardiness)
34
permanent(calm, strong, secure, strain)
33
unalterable(calm, strong, secure, strain)
31
unvarying(calm, quiet, strong, secure)
29
rigid(severe, strain, fixed, stiff)
29
unchanging(change, severe, firm, harsh)
28
perpetual(strain, steady, stable, regular)
28
steadfast(calm, strong, secure, strain)
26
lasting(calm, strong, secure, strain)
24
enduring(calm, strong, secure, strain)
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APASmart Define. (2015). invariable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/invariable/thesaurus/synonyms
ChicagoSmart Define. 2015. "invariable thesaurus" https://smartdefine.org/invariable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, invariable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/invariable/thesaurus/synonyms>.
MLASmart Define. "invariable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/invariable/thesaurus/synonyms>