1. Not having official authority or sanction
   "a sort of unofficial mayor"; "an unofficial estimate"; "he participated in an unofficial capacity" 
2. Not officially established
   "the early election returns are unofficial"

See also: drumhead, informal, loose, summary, unauthorised [Brit], unauthorized, unconfirmed, unofficially, unsanctioned, wildcat

Antonym: official

Encyclopedia: Unofficial

• caudate nucleus
• clairvoyant
• clam
• clam chowder
• clam dip
• clam up
• clamant
• Clamato
• Clamatores
• clamatorial
• clambake
• clamber
• clammily
• clamminess
• clammy
• clammy chickweed
• clammy locust
• clammyweed
• clamor
• clamoring
• clamorous
• clamorously
• clamour
• clamouring
• clamp