Antonyms of adj unofficial

2 senses of unofficial

Sense 1
unofficial (vs. official) -- (not having official authority or sanction; "a sort of unofficial mayor"; "an unofficial estimate"; "he participated in an unofficial capacity")

official (vs. unofficial) -- (having official authority or sanction; "official permission"; "an official representative")
        => authoritative, authorized, authorised -- (sanctioned by established authority; "an authoritative communique"; "the authorized biography")
        => ex officio -- (by virtue of an office or position; "the head of the department serves as an ex officio member of the board")
        => formal -- (characteristic of or befitting a person in authority; "formal duties"; "an official banquet")
        => formalized, formalised -- (given formal standing or endorsement; made official or legitimate by the observance of proper procedures)
        => semiofficial -- (having some official authority or sanction)

Sense 2
unofficial -- (not officially established; "the early election returns are unofficial")

INDIRECT (VIA unconfirmed) -> confirmed -- (having been established or made firm or received the rite of confirmation; "confirmed reservations"; "received confirmed reports of casualties"; "a confirmed Catholic")

Similarity of adj unofficial

2 senses of unofficial

Sense 1
unofficial (vs. official) -- (not having official authority or sanction; "a sort of unofficial mayor"; "an unofficial estimate"; "he participated in an unofficial capacity")
       => drumhead, summary -- (performed speedily and without formality; "a summary execution"; "summary justice")
       => informal, loose -- (not officially recognized or controlled; "an informal agreement"; "a loose organization of the local farmers")
       => unauthorized, unauthorised, wildcat -- (without official authorization; "an unauthorized strike"; "wildcat work stoppage")
       => unsanctioned -- (without explicit official permission; "unsanctioned use of company cars")
          Also See-> unauthorized#1, unauthorised#1

Sense 2
unofficial -- (not officially established; "the early election returns are unofficial")
       => unconfirmed (vs. confirmed) -- (not finally established or settled; "an unconfirmed letter of credit"; "unconfirmed rumors")