unofficial

adjectives

not having official authority or sanction
"a sort of unofficial mayor"; "an unofficial estimate"; "he participated in an unofficial capacity"
unofficial
antonym
official
is similar to
performed speedily and without formality
"a summary execution"; "summary justice"
drumhead, summary
is similar to
not officially recognized or controlled
"an informal agreement"; "a loose organization of the local farmers"
informal, loose
is similar to
without official authorization
"an unauthorized strike"; "wildcat work stoppage"
unauthorised, unauthorized, wildcat
is similar to
without explicit official permission
"unsanctioned use of company cars"
unsanctioned
see also
not endowed with authority
unauthorised, unauthorized
not officially established
"the early election returns are unofficial"
unofficial
is similar to
not finally established or settled
"an unconfirmed letter of credit"; "unconfirmed rumors"
unconfirmed