30 entries under defensible topic. ×

40
sound(adjective, reasonable, strain, sensible, rational)
24
impregnable(adjective, strain, firmness, labour, safety)
16
justifiable(adjective, sound, right, reasonable, slight)
12
reasonable(adjective, sound, slight, honest, sensible)
5
well-founded(adjective, reasonable, justified)
4
admissible(adjective, reasonable, justified)
4
arguable(adjective, sound, reasonable, sensible, rational)
3
logical(adjective, sound, reasonable, sensible, proper)
2
condonable(adjective, sound, reasonable, rational, justified)
2
vindicable(adjective, sound, reasonable, rational, justified)
2
warrantable(adjective, sound, reasonable, rational, justified)
1
allowable(reasonable, justified)
1
fair(reasonable, justified)
1
forgivable(reasonable, justified)
1
pardonable(reasonable, justified)
1
permissible(reasonable, justified)
1
right(reasonable, justified)
1
understandable(reasonable, justified)
1
valid(reasonable, convincing, credible, believable, plausible)
0
correct(reasonable, justified)
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APASmart Define. (2015). tenable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/tenable/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenable thesaurus" https://smartdefine.org/tenable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, tenable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/tenable/thesaurus/synonyms>.
MLASmart Define. "tenable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/tenable/thesaurus/synonyms>