un ‧ au ‧ tho ‧ rized BrE AmE ( also unauthorised British English ) /ʌnˈɔːθəraɪzd $ -ˈɒː-/ adjective
[ Word Family: noun : ↑ authority , ↑ authorization , ↑ authoritarian , ↑ authoritarianism ; adjective : ↑ authoritarian , ↑ authoritative , authorized ≠ ↑ unauthorized ; verb : ↑ authorize ; adverb : ↑ authoritatively ]
without official approval or permission:
the unauthorized use of government funds
Unauthorized personnel are not allowed on the premises.