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Synonyms

unofficial

British  
/ ˌʌnəˈfɪʃəl /

adjective

  1. not official or formal

    an unofficial engagement

  2. not confirmed officially

    an unofficial report

  3. (of a strike) not approved by the strikers' trade union

  4. (of a medicinal drug) not listed in a pharmacopoeia

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Unofficial mines were created by property owners digging underneath their gardens and creating the warren of tunnels which are now causing SCC's engineers such a headache.

From BBC • Aug. 20, 2025

Unofficial tallies from Wednesday’s election show him winning a decisive victory, with nearly 60 percent of the vote.

From New York Times • Feb. 15, 2024

Unofficial results released by the Pennsylvania Department of State show both Panella and Stabile retaining their seats, each with a margin of hundreds of thousands of votes.

From Seattle Times • Nov. 10, 2023

Unofficial sightings of the woodpecker have continued over the years.

From Washington Times • Oct. 17, 2023

Unofficial residents, known as Burghers, came to be admitted to share in the management of affairs.

From Native Races and the War by Butler, Josephine E. (Josephine Elizabeth Grey)

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.