Deaf or unable to hear.

Muffled or indistinct in sound.

Unresponsive or inattentive; oblivious.

Hidden, secret, or concealed (figurative).

A person who is deaf.

An individual lacking hearing ability.

Someone unable to perceive sound clearly.

A term for a hard-of-hearing person.

To make dull or muted in sound.

To deprive of brightness or clarity.

To render less intense or vivid.

To blunt the edge or sharpness of something.