60 entries under secure topic. ×

42
firm(noun, adjective, clear, strong, sound)
25
steadfast(adjective, clear, strong, tough)
16
set(adjective, strong, flat, firm)
13
fixed(adjective, strong, sound, tough)
13
strong(adjective, sound, tough, fit)
12
sticky(adjective, determined, thick, coherence)
11
glutinous(adjective, tough, thick, tacky)
11
viscous(adjective, tough, thick, tacky)
10
adhesive(adjective, tough, thick, tacky)
10
immovable(adjective, strong, firm, solid)
9
fast(adjective, strong, free, tough)
8
viscid(adjective, tough, tacky, sticky)
7
steady(adjective, strong, sound, tough)
7
tight(adjective, close, strong, hard, free)
6
durable(adjective, strong, sound, tough)
5
gummy(adjective, thick, tacky, sticky)
5
stable(adjective, strong, sound, tough)
4
solid(adjective, strong, sound, tough)
4
tacky(adjective, thick, sticky, viscous)
2
permanent(tough, firm, true, fixed)
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APASmart Define. (2015). tenacious thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/tenacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenacious thesaurus" https://smartdefine.org/tenacious/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, tenacious thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/tenacious/thesaurus/synonyms>.
MLASmart Define. "tenacious thesaurus" 6 November 2015. Web. 21 September 2026. <https://smartdefine.org/tenacious/thesaurus/synonyms>