8
unlawfully(adverb, illicitly, inexcusably, unpardonably)
7
illicitly(adverb, unlawfully)
6
illegitimately(adverb, illicitly, unlawfully)
6
lawlessly
4
wrongfully
3
criminally
3
falsely(adverb, wrongly)
2
unfairly(adverb, extremely, excessively, wrongly, improperly)
2
badly(adverb, wrongly)
2
in an unlawful manner
1
feloniously
1
forbiddenly
1
improperly(adverb, wrongly)
1
unconstitutionally
1
unduly
1
unjustly
1
wrongly(adverb, wrongly)
1
aberrantly(adverb, wrongly)
1
actionably
1
clandestinely
11 years ago|2.6k views|share |citing 
APASmart Define. (2015). illegally thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/illegally/thesaurus/synonyms
ChicagoSmart Define. 2015. "illegally thesaurus" https://smartdefine.org/illegally/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, illegally thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/illegally/thesaurus/synonyms>.
MLASmart Define. "illegally thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/illegally/thesaurus/synonyms>