9
illicitly(adverb, illegally, unlawfully)
6
unlawfully(adverb, illegally, illicitly)
5
illegally(adverb, illegally)
5
lawlessly(adverb, illegally)
4
criminally(adverb, illegally, illicitly, unlawfully)
3
out of wedlock(expression, idiom, adverb)
3
wrongfully(adverb, illegally)
2
bastardly
2
falsely
2
in an unlawful manner
2
misbegottenly
2
unconstitutionally(adverb, illegally)
2
unjustly(adverb, illegally, illicitly, unlawfully)
1
actionably(adverb, illegally)
1
adulterinely
1
basally
1
clandestinely
1
dishonestly(adverb, illicitly, unlawfully)
1
dishonorably
1
extramaritally
13 years ago|1.8k views|share |citing 
APASmart Define. (2013). illegitimately thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/illegitimately/thesaurus/synonyms
ChicagoSmart Define. 2013. "illegitimately thesaurus" https://smartdefine.org/illegitimately/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2013, illegitimately thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/illegitimately/thesaurus/synonyms>.
MLASmart Define. "illegitimately thesaurus" 28 June 2013. Web. 21 September 2026. <https://smartdefine.org/illegitimately/thesaurus/synonyms>