13
indefensible(adjective, wrong, accusation, vice, forgiveness)
12
inexcusable(adjective, wrong, accusation, vice, forgiveness)
11
unjustifiable(adjective, unwarranted, accusation, vice, forgiveness)
10
unforgivable(adjective, wrong, awful, terrible, unwarranted)
8
inexpiable(adjective, vice, inexcusable, unforgivable)
5
irremissible
5
reprehensible(adjective, inexcusable, unforgivable)
4
intolerable(adjective, unforgivable)
4
unwarrantable
3
unconscionable(adjective, wrong, indefensible, unwarrantable)
3
untenable(adjective, indefensible, inexcusable, unwarrantable)
2
unreasonable
2
blameworthy
2
disgraceful
2
execrable
2
foul
2
shameful
2
unallowable
2
unwarranted
2
vicious
11 years ago|2.1k views|share |citing 
APASmart Define. (2015). unpardonable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unpardonable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unpardonable thesaurus" https://smartdefine.org/unpardonable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, unpardonable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unpardonable/thesaurus/synonyms>.
MLASmart Define. "unpardonable thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/unpardonable/thesaurus/synonyms>