| prohibited(verb, adjective, adverb, irregular, restricted) |
| verboten(adjective, allow, illegal, allowed, prohibited) |
| banned(verb, adjective, adverb, irregular, restricted) |
| illegal(adjective, adverb, offensive, unreasonable, improper) |
| taboo(adjective, adverb, allow, informal, irregular) |
| proscribed(verb, adjective, irregular, unwarranted, illegitimate) |
| outlawed(verb, adjective, offensive, irregular, unwarranted) |
| illicit(adjective, illegal) |
| unlawful(adjective, illegal) |
| disallowed(verb, adjective, prohibited, excluded) |
| barred(verb, adjective, prohibited, excluded) |
| out of bounds(expression, adjective, idiom, restricted, prohibited) |
| tabu |
| out(adjective, adverb) |
| unauthorized(adjective, illegal) |
| contraband(adjective, unlawful, prohibited, banned, outlawed) |
| interdicted |
| off limits(expression, adjective, idiom, offensive, permitted) |
| unmentionable(adjective, offensive, permitted, prohibited, unspeakable) |
| criminal(adjective, illegal) |