muffled
1. [ adjective ] being or made softer or less loud or clear
Synonyms: dull softened muted
Examples:

"the dull boom of distant breaking waves" "muffled drums" "the muffled noises of the street" "muted trumpets"

Related terms: soft
2. [ adjective ] wrapped up especially for protection or secrecy
Examples:

"children muffled almost to the eyebrows"

Related terms: covered