In a forbidden or unlawful manner.

(archaic) second-person singular simple present form of forbid

Capable of being forbidden.

plural of forbiddal

(archaic) The act of forbidding something.

An experiment where an infant is isolated from the normal use of language in an attempt to discover the fundamental character of human nature or the origin of language.

plural of forbidden fruit

The quality of being forbidding.

The state, quality or measure of being forbidden.

Any of the degrees of consanguinity and affinity within which people are not permitted to marry.