English Thesaurus

Synonyms of 'unauthorized'

(adjective) 
Definition
done or made without official permission
the unauthorized use of a military vehicle
Synonyms
illegal
It is illegal to interfere with emergency radio frequencies.
,
unofficial
Unofficial estimates speak of at least two hundred dead.
,
unlawful
employees who believe their dismissal was unlawful
,
unconstitutional
, ,
off the record
,
under-the-table
,
unapproved
,
unsanctioned
Opposites
, ,
sanctioned
, ,
warranted
, ,

Additional synonyms

in the sense of unlawful
Definition
not permitted by law
employees who believe their dismissal was unlawful
Synonyms
banned,
outlawed,
unlicensed,
under-the-table,
against the law,
actionable
in the sense of unofficial
Definition
not confirmed officially
Unofficial estimates speak of at least two hundred dead.
Synonyms
unconfirmed,
undocumented,
uncorroborated

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Video: pronunciation of 'unauthorized'

Source

Thesaurus for unauthorized from the Collins English Thesaurus
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