soundproof

Verb

• insulate against noise
  • "Proust had his apartment soundproofed"
• To make resistant to transmitting sound.

Adjective Satellite

• impervious to, or not penetrable by, sound
  • "a soundproof room"

Adj

• Not allowing sound through.

Examples

• "The contestant was placed in a soundproof booth so he could not receive help from the audience."
• "We soundproofed the room so we couldn't hear the road noises; unfortunately we couldn't hear the fire alarm either."