FORBIDDEN

[adjective]Something which is forbidden is not permitted, esp. by law.Smoking is forbidden in the cinema.We don't talk about politics at home - it's forbidden territory/ground because we all disagree.Sport is a forbidden subject when Marcus is here - he hates it.(literary) When people talk about forbidden fruit they mean something, esp. sexual, which has a greater attraction because it is not allowed.Other men's wives were irresistible to him - the forbidden fruit that he longed to taste.