A communication disorder is a disease or condition that partially or totally prevents human communication. The defect can be in producing, receiving or understanding the communication.
Examples of communication disorders:
autism -- a developmental defect that affects understanding of emotional communication
aphasia -- loss of the ability to produce or comprehend language
... of sinners, and to her all should flee as
to a mother. She should be invoked. He also
gives prayers to Mary (cf. the De tabernaculis, and
Hortus rosarum, ...