6
unauthorized
5
unofficial(adjective, unapproved)
5
unsanctioned
4
illegal
4
uncertified
3
illegitimate
3
illicit
3
prohibited
3
wildcat
1
forbidden
1
self-appointed
1
unaccredited
1
unapproved
1
unlawful
1
unlicenced
1
unlicensed
0
no-no
0
over the line
0
pirate
0
undue
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13 years ago|784 views|share |citing 
APASmart Define. (2013). unauthorised thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unauthorised/thesaurus/synonyms
ChicagoSmart Define. 2013. "unauthorised thesaurus" https://smartdefine.org/unauthorised/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2013, unauthorised thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unauthorised/thesaurus/synonyms>.
MLASmart Define. "unauthorised thesaurus" 28 June 2013. Web. 21 September 2026. <https://smartdefine.org/unauthorised/thesaurus/synonyms>