Final answer:
Deafness can be caused by various factors and results in the partial or complete inability to hear. While physical deafness affects the ability to hear, the true deafness lies in the mind's inability to comprehend or understand sound.
Step-by-step explanation:
Deafness is the partial or complete inability to hear. It can be caused by different factors, such as congenital deafness, conductive hearing loss, or sensorineural hearing loss. While deafness of the ear can prevent the physical act of hearing, the true deafness lies in the mind, which refers to the inability to comprehend or understand sound. This can be seen in cases where individuals have difficulty processing or interpreting the sounds they hear, despite having functioning ears.