2
groundless
2
idle
2
illegitimate(adjective, extreme, irregular, improper, extravagant)
2
illicit(adjective, irregular, unwarranted, criminal, illegitimate)
2
outlawed(adjective, irregular, unwarranted, criminal, illegal)
2
unconscionable(adjective, extreme, improper, senseless, excessive)
2
unfounded
2
unlawful(adjective, extreme, irregular, improper, extravagant)
2
untenable
2
wrongful(adjective, extreme, irregular, improper, extravagant)
1
absonant(adjective, extreme, improper, senseless, excessive)
1
actionable
1
against the law(expression, idiom)
1
anarchic
1
anarchistic
1
anomic
1
arbitrary(adjective, unreasonable, extreme, improper, stiff)
1
black market
1
bootleg
1
chargeable
11 years ago|1.7k views|share |citing 
APASmart Define. (2015). unwarrantable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unwarrantable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unwarrantable thesaurus" https://smartdefine.org/unwarrantable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unwarrantable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unwarrantable/thesaurus/synonyms>.
MLASmart Define. "unwarrantable thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/unwarrantable/thesaurus/synonyms>