This is the 11073rd most frequent Russian word.
глухих
"Глухих" means "of deaf people" or "deaf" (genitive or accusative plural form).
In this sentence, 'глухих' refers to people who are deaf or hard of hearing, as the adjective is used in the context of describing a group.
Он преподаёт язык жестов для глухих.
He teaches sign language for the deaf.
In this context, 'глухих' describes the remoteness or isolation of the area which might metaphorically be referred to as 'deaf' to denote its quietness or disconnection from the surroundings.
Мы проехали через деревню в глухих местах.
We passed through a village in the remote areas.
Here, 'глухих' again directly refers to individuals who are deaf, emphasizing the role of a companion or service animal in assisting them in daily tasks.