unofficial

US /ˌʌn.əˈfɪʃ.əl/

UK /ˌʌn.əˈfɪʃ.əl/

1.

không chánh thức

not officially authorized or confirmed.

:

•

unofficial reports that dozens of people were injured

:

unauthenticated unconfirmed uncorroborated unsubstantiated undocumented off the record unauthorized unsanctioned uncertified informal casual unaccredited wildcat

:

official confirmed formal

:

unofficially