Antonyms of adj unauthorized

2 senses of unauthorized

Sense 1
unauthorized (vs. authorized), unauthorised -- (not endowed with authority)

authorized (vs. unauthorized), authorised -- (endowed with authority)
        => accredited, commissioned, licensed, licenced -- (given official approval to act; "an accredited college"; "commissioned broker"; "licensed pharmacist"; "authorized representative")
        => approved, sanctioned -- (established by authority; given authoritative approval; "a list of approved candidates")
        => canonized, canonised, glorified -- (accorded sacrosanct or authoritative standing)
        => empowered, sceptered, sceptred -- (invested with legal power or official authority especially as symbolized by having a scepter)

Sense 2
unauthorized, unauthorised, wildcat -- (without official authorization; "an unauthorized strike"; "wildcat work stoppage")

INDIRECT (VIA unofficial) -> official -- (having official authority or sanction; "official permission"; "an official representative")

Similarity of adj unauthorized

2 senses of unauthorized

Sense 1
unauthorized (vs. authorized), unauthorised -- (not endowed with authority)
       => self-appointed -- (designated or chosen by yourself; "a self-appointed guardian of public morals")
       => unaccredited, unlicensed, unlicenced -- (lacking official approval)
          Also See-> illegitimate#2; unofficial#1

Sense 2
unauthorized, unauthorised, wildcat -- (without official authorization; "an unauthorized strike"; "wildcat work stoppage")
       => unofficial (vs. official) -- (not having official authority or sanction; "a sort of unofficial mayor"; "an unofficial estimate"; "he participated in an unofficial capacity")