| illegal(adjective, illegal, permitted, prohibition, sanctioned) |
| illegitimate(adjective, legal, illegal, permitted, sanctioned) |
| illicit(adjective, legal, illegal, forbidden, undueness) |
| unofficial(adjective, informal, permitted, sanctioned, illegality) |
| unsanctioned(adjective, illegal, permitted, pirate, sanctioned) |
| prohibited(adjective, prohibition, unapproved) |
| unlawful(adjective, illegal, permitted, sanctioned, undueness) |
| forbidden(adjective, illegal, unapproved) |
| unlicensed(adjective, illegal, prohibition) |
| unauthorised |
| unwarranted(adjective, permitted, laxity, sanctioned, illegality) |
| unconstitutional(adjective, illegal, permitted, sanctioned, undueness) |
| criminal(adjective, illegal) |
| felonious(adjective, illegal) |
| informal(adjective, illegality) |
| unapproved(adjective, permitted, sanctioned) |
| verboten(adjective, illegal) |
| wrongful(adjective, illegal, permitted, sanctioned) |
| bootleg(adjective, illegal) |
| contraband(adjective, prohibition, unlawful) |