There are numerous synonyms for the term "not approved" that can be used to designate an item, action, or proposal that has not received official authorization or endorsement. Some of these may include words like disapproved, denied, rejected, banned, forbidden, unlawful, unauthorized, unsanctioned, tabooed, censured, or prohibited. Depending on the context and level of formality, there may be several synonyms that can be used interchangeably or in combination to convey the degree of disapproval or non-compliance with certain rules or standards. By using creative vocabulary and choosing the right words, writers and speakers can effectively convey their message and express their opinions.