0 the fact of being stupid or not intelligent: --
1 the fact of not speaking or of not being able to speak: --
Developmental problems include Angelman syndrome, which can cause epilepsy, dumbness and severe learning difficulties.
My last dentist actually turned the enforced dumbness of his victims into a sort of comedy routine.
His sudden appearance struck instant dumbness in 30 boys.
His poetry is fuelled by astonishment at the craziness, weirdness, dumbness, marvellousness, of the life he finds himself in.
If people are dumb, laws are there to prevent their dumbness from hurting other people.
The banks profited from the naiveness and dumbness of the population.