unauthorised
unauthorized
banned
barred
contraband
forbade
forbid
forbidden
illegal
illicit
nonpermissible
not permitted
off limits
out of bounds
outlawed
prohibited
ruled out
taboo
tabooed
unallowed
under the ban
unlawful
unpermissible
unsanctioned
untouchable
verboten
vetoed
clandestine
curio
defamatory
double-action
downright
extemporary
high-class
illegitimate
medico-legal
peripatetic
premarital
promiscuous
reputable
semi-automatic
slanderous
state-regulated
treasonable
underage
unregistered
unwarrantable
veterinary
licensed