Synonyms of the word

unauthorised

• adj. Not authorised; having no authority.

illegitimate

• adj. Illegal; against the law.
• adj. Born to unmarried parents.
• adj. Illogical; incorrectly deduced.
• adj. Not authorized by good usage; not genuine; spurious.
• adj. (botany) Involving the fertilization of pistils by stamens not of their own length, in heterogonously…
• n. someone born illegitimately.

self-appointed

• adj. Appointed by oneself.

unaccredited

• adj. Not accredited; lacking accreditation.

unauthorized

• adj. not having any authority.
• adj. without official authorization.

unlicenced

• adj. (Britain) Misspelling of unlicensed.

unlicensed

• adj. Not licensed; not officially authorized.
• adj. Free from requiring a license.

unofficial

• adj. Not officially established.
• adj. Not acting with official authority.
• adj. (pharmacology) Not listed in a national pharmacopeia etc.

wildcat

• n. A cat that lives in the wilderness, specifically.
• n. (figuratively) A person who acts like a wildcat, (usually) a violent and easily-angered person or a sexually…
• n. (American football) An offensive formation with an unbalanced line and a snap directly to the running…
• n. (nautical) A wheel that can be adjusted so as to revolve either with or on the shaft of a capstan.
• n. (firearms) Clipping of wildcat cartridge.
• n. (uncommon) Clipping of wildcat strike, a strike undertaken without authorization from the relevant trade…
• n. (obsolete) Clipping of wildcat money, notes issued by a wildcat bank.
• adj. (usually pejorative) Of or concerning businesses operating outside standard or legitimate practice, especially.
• adj. (firearms) Of or concerning customized or hand-made cartridges.
• adj. Unauthorized by the proper authorities.
• v. To drill for oil in an area where no oil has been found before.