forbidden

adjective

for·​bid·​den fər-ˈbi-dᵊn 

fȯr-

1

: not permitted or allowed

2

: not conforming to the usual selection principles

—used of quantum phenomena

forbidden transition

forbidden radiation

forbidden spectral line

Synonyms of forbidden

• prohibited
• banned

Examples of forbidden in a Sentence

trespassing is forbidden

Recent Examples on the Web

At the core, as has been noted after the release of the teaser a couple months ago, is the steamy, forbidden relationship between Catherine Earnshaw (Robbie) and Heathcliff (Elordi). —Tom Tapp, Deadline, 13 Nov. 2025

In the forbidden world (of music) there was no judgment. —George Varga, San Diego Union-Tribune, 9 Nov. 2025

An ancient forbidden kingdom nestled by the Tibetan Plateau and some of the tallest peaks in the world, Mustang didn’t allow tourists until 1992 and formally joined the contemporary Federation of Nepal in 2008. —Joe Baur, Outside, 31 Oct. 2025

Lina, a young woman facing harsh coming-of-age rituals, forms a forbidden connection with a man. —Anna Marie De La Fuente, Variety, 3 Oct. 2025

Word History

First Known Use

13th century, in the meaning defined at sense 1

Phrases Containing forbidden

• forbidden fruit