unauthorized
adjective
[ ʌnˈɔːθərʌɪzd ]
• not having official permission or approval.
• "unauthorized access to the computer system"
Similar:
unofficial,
unsanctioned,
uncertified,
unaccredited,
unlicensed,
unwarranted,
unapproved,
disallowed,
prohibited,
banned,
barred,
forbidden,
outlawed,
illegal,
against the law,
illegitimate,
illicit,
interdicted,
proscribed,
wildcat,