Define forbidden not permitted or allowed not conforming to the usual selection principles used of quantum phenomena forbidden in a sentence.Synonyms for forbidden at Thesaurus.com with free online thesaurus, antonyms, and definitions. Dictionary and Word of the Day..Forbidden definition, a past participle of forbid. See more..Forbidden was a thrash metal band from the San Francisco Bay Area. Formed in as Forbidden Evil, the group was founded by Russ Anderson and Craig Locicero, who .This is forbidden love at it’s darkest. I knew there would be discomfort going into reading it, but I was greatly surprised by the sympathy I felt for the connection .