deaden

verb

impair in vigor, no longer alive, active, in play

L331338 on Wikidata ↗

Wiktionary

Pronunciation: /ˈdɛdən/

verb

Etymology: From dead + -en. Compare Dutch doden (“to kill”), West Frisian deadzje (“to kill”).

To render less lively; to diminish; to muffle.
“deaden the pain”
“deaden sound”
To become less lively; to diminish (by itself).
To make soundproof.
“to deaden a wall or a floor”