Definitions

1. adjective

resistant to sound; able to prevent sound from passing through

“The soundproof room allowed us to practice music without disturbing anyone else.”

2. verb

to make (a room or area) soundproof

“The contractors soundproofed the recording studio to minimize echo.”

3. noun

a device or material used to prevent sound from passing through

“The soundproofing on the apartment walls was inadequate.”