ILLEGAL Synonyms: 95 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/illegal
WebSynonyms for ILLEGAL: unlawful, illicit, criminal, felonious, wrongful, unauthorized, forbidden, illegitimate; Antonyms of ILLEGAL: legal, lawful, legitimate, right, ethical, good, permitted, righteous
DA: 59 PA: 90 MOZ Rank: 94