Between 1989 and 2004, he served as an unofficial and unpaid adviser to Yassir Arafat.
To be sure, not-yet-confirmed appointees have some capacity to do their jobs on an unofficial basis.
TEL AVIV – If hell were a travel destination, Qusay Omran would be its unofficial tour guide.
Instead, it looked like the first unofficial campaign event of a 2016 Hillary Clinton presidential run.
Civilization gamers' unofficial motto is "one more turn," a small deception masking self-indulgence as self-control.
Roper set it up as a panel of big businessmen to act as unofficial advisers to President Roosevelt.
You must look at it this way: what I know is unofficial; what he knows is official.
These determinations are in substantial agreement with a large number of other estimates, both official and unofficial.
But he was very ready with his pen, and served as a kind of unofficial poet-laureate.
I shall be excited to see what the unofficial Government organs make of you.
early 14c., from Old French oficial "law officer; bishop's representative" (12c.) and directly from Late Latin officialis "attendant to a magistrate, public official," noun use of officialis (adj.) "of or belonging to duty, service, or office" (see official (adj.)). Meaning "person in charge of some public work or duty" first recorded 1550s.
late 14c., "performing a service; required by duty," from Old French oficial "official; main, principal" (14c., Modern French officiel) or directly from Late Latin officialis "of or belonging to duty, service, or office," from Latin officium (see office). Meaning "pertaining to an office or official position" is from c.1600.
unofficial un·of·fi·cial (ŭn'ə-fĭsh'əl)
Of or being a drug that is not listed in the United States Pharmacopeia or the National Formulary.
official of·fi·cial (ə-fĭsh'əl)
Authorized by or contained in the U.S. Pharmacopoeia or National Formulary. Used of drugs.