67 entries under reasonable topic. ×

40
sound(adjective, strain, sensible, rational)
16
justifiable(adjective, sound, right, slight)
15
defensible(adjective, attack, sound, right)
14
plausible(adjective, sound, slight, sensible)
12
credible(adjective, sound, sensible, rational)
10
believable(adjective, sound, sensible, rational)
10
defendable(adjective, attack, sound, rational)
10
maintainable(adjective, sound, rational, defended)
8
conceivable(adjective, realistic, authentic, satisfying)
7
rational(adjective, sound, honest, sensible)
6
excusable(adjective, sound, right, rational)
6
imaginable(adjective, realistic, authentic, satisfying)
6
possible(adjective, realistic, authentic, satisfying)
5
likely(adjective, realistic, authentic, satisfying)
5
well-founded(adjective, justified, defensible)
4
acceptable(adjective, sound, rational, realistic)
4
admissible(adjective, justified, defensible)
4
arguable(adjective, sound, sensible, rational)
4
trustworthy(adjective, sound, rational, realistic)
3
creditable(adjective, realistic, authentic, satisfying)
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APASmart Define. (2015). tenable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/tenable/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenable thesaurus" https://smartdefine.org/tenable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, tenable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/tenable/thesaurus/synonyms>.
MLASmart Define. "tenable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/tenable/thesaurus/synonyms>