Word: soundproof
Part of speech: Adjective
Syllables: sound
proof
Definition: Not allowing sound through.
Morphemes:
Affix: sound
Language: en
PoS: Adjective
Meaning: Having the property of soundness; the quality of being prudent and sensible
Affix: -proof
Language: en
PoS: Suffix
Meaning: Used to form adjectives denoting an impervious or impenetrable quality.