The meaning of FORBIDDEN is not permitted or allowed. How to use forbidden in a sentence. Learn how to fix the 403 Forbidden error on your website with 11 proven solutions, from browser fixes to server-side adjustments. Learn the definition of forbidden as an adjective meaning not allowed, especially by law, and see examples and idioms. Find translations of forbidden in Chinese, Spanish, Portuguese and more languages. Learn the meaning and usage of the word forbidden , which can be an adjective or a past participle of forbid. Find synonyms, translations, and related terms for forbidden in different contexts and languages.