FluentPlex

unofficial

/ʌn.əˈfɪʃ.əl/ adjective B2
  1. Not officially established. · the unofficial results of the ballot
  2. Implicitly true but withheld and/or contradicted by authority. · The unofficial reason for invading the nation, however, was to control their resources.
  3. Not acting with official authority. · an unofficial adviser
  4. Not listed in a national pharmacopeia etc.
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From the library

That comes of being an unofficial personage.”
A Study in Scarlet, p. 25 · B2
“She does plenty of unofficial preaching as it is.
Anne of Green Gables, p. 260 · C1
“I think you want a little unofficial help.
The Return of Sherlock Holmes, p. 24 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.