Enter a clue or pattern or both:
The Clue
Impervious, in a way (10 letter answer)
The Answer
SOUNDPROOF
Tags
Notes
The answer SOUNDPROOF is so rare that it appears less than once every 2500 puzzles.
Related Clues
Kind of room
Definition
SOUNDPROOF as a verb:
1. insulate against noise; "Proust had his apartment soundproofed"
SOUNDPROOF as an adjective:
1. impervious to, or not penetrable by, sound; "a soundproof room"