31 entries under constant topic. ×

41
firm(adjective, strain, true, firmness)
37
sound(adjective, reasonable, strain, firm, true)
37
stable(adjective, strain, firm, true, firmness)
22
fast(adjective, strain, firm, firmness)
19
tight(adjective, strain, firm, true, firmness)
14
secure(adjective, sound, reasonable, firm, true)
3
fortified(adjective, firm, true, fixed)
2
faithful(firm, true, fixed, steadfast)
2
immovable(adjective, firm, true, fixed, resolute)
2
indelible(firm, true, fixed, steadfast)
1
close(adjective, firm, true, fixed)
1
fixed(adjective, firm, true, steady, resolute)
1
resolute(strong, firm, true, fixed)
1
set(adjective, firm, true, fixed)
1
staunch(adjective, strong, firm, true, fixed)
1
sure(adjective, firm, true, fixed, resolute)
1
tenacious(adjective, firm, true, fixed)
0
adherent(firm, true, fixed, steadfast)
0
ardent(firm, true, fixed, steadfast)
0
attached(firm, true, fixed, steadfast)
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APASmart Define. (2015). impregnable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, impregnable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>.
MLASmart Define. "impregnable thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms>