English Thesaurus

Synonyms of 'unofficial'

(adjective) 
Definition
not confirmed officially
Unofficial estimates speak of at least two hundred dead.
Synonyms
unconfirmed
,
off the record
Those remarks were supposed to be off the record.
,
unsubstantiated
unsubstantiated rumours about his private life
,
private
He held a private meeting with the country's political party leaders.
,
personal
That's my personal property!
, ,
undocumented
,
uncorroborated
(adjective) 
Definition
not authorized or approved by the relevant organization or person
Rail workers have voted to continue their unofficial strike.
Synonyms
unauthorized
the unauthorized use of a military vehicle
,
informal
She is refreshingly informal.
,
unsanctioned
,
casual
an easy-going young man with a casual approach to life
,
wildcat

Additional synonyms

in the sense of casual
Definition
being or seeming careless or nonchalant
an easy-going young man with a casual approach to life
in the sense of informal
Definition
relaxed and friendly
She is refreshingly informal.
Synonyms
in the sense of off the record
Definition
not for publication
Those remarks were supposed to be off the record.
Synonyms
classified,
in confidence,
not for publication,
not for circulation

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Video: pronunciation of 'unofficial'

Source

Thesaurus for unofficial from the Collins English Thesaurus
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