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Synonyms for Illegal (same or very similar meaning)

WordNet sense 1 (contrary to or forbidden by law):
illegitimate, illicit, unlawful

WordNet sense 2 (recently stolen or smuggled):
hot

WordNet sense 3 (involving or being or having the nature of a crime):
criminal, felonious

WordNet sense 4 (forbidden by law):
banned, prohibited


From the ODE community, based on WordNetadd/edit