20
unjustifiable(adjective, unwarranted, accusation, vice, forgiveness)
17
untenable(adjective, weak, vulnerable, submission, helpless)
12
inexcusable(adjective, wrong, unwarranted, unnecessary, accusation)
12
unpardonable(adjective, wrong, accusation, vice, forgiveness)
12
unsustainable(adjective, invalid, defended, verbal attack, untenable)
11
insupportable(adjective, defended, verbal attack, inexcusable)
10
unforgivable(adjective, wrong, unwarranted, forgiveness, unjustified)
10
unreasonable(adjective, unwarranted, unnecessary, wanton, unjustified)
10
unwarrantable(adjective, unwarranted, unnecessary, unjustified, undeserved)
10
unwarranted(adjective, right, reasonable, unnecessary, wanton)
7
inexpiable(adjective, vice, inexcusable)
7
vulnerable(adjective, insecure, exposed, helpless, powerless)
6
gratuitous(adjective, unwarranted, unnecessary, necessary, wanton)
6
groundless(adjective, senseless, unwarranted, wanton, gratuitous)
6
unfounded(adjective, senseless, unwarranted, wanton, gratuitous)
6
unjustified(adjective, unwarranted, unnecessary, wanton, unfounded)
5
baseless(adjective, senseless, unwarranted, wanton, gratuitous)
5
defenseless(adjective, vulnerable, insecure, exposed, helpless)
5
intolerable
5
outrageous(adjective, defended, verbal attack)
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APASmart Define. (2015). indefensible thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/indefensible/thesaurus/synonyms
ChicagoSmart Define. 2015. "indefensible thesaurus" https://smartdefine.org/indefensible/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, indefensible thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/indefensible/thesaurus/synonyms>.
MLASmart Define. "indefensible thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/indefensible/thesaurus/synonyms>