Synonyms: unauthorised, unauthorized
Definition: not endowed with authority
Similar words: self-appointed
Definition: designated or chosen by yourself
Usage: a self-appointed guardian of public morals
Similar words: unaccredited, unlicenced, unlicensed
Definition: lacking official approval
Synonyms: unauthorised, unauthorized, wildcat
Definition: without official authorization
Usage: an unauthorized strike; wildcat work stoppage
Similar words: unofficial
Definition: not having official authority or sanction
Usage: a sort of unofficial mayor; an unofficial estimate; he participated in an unofficial capacity