Etymology
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deaden (v.)

1660s "deprive of or diminish (some quality), to make dead (figuratively)," from dead (adj.) + -en (1). Earlier the verb was simply dead. Related: Deadened; deadening.

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Definitions of deaden

deaden (v.)
make vague or obscure or make (an image) less visible;
Synonyms: dampen / damp
deaden (v.)
cut a girdle around so as to kill by interrupting the circulation of water and nutrients;
Synonyms: girdle
deaden (v.)
make vapid or deprive of spirit;
deadened wine
deaden (v.)
lessen the momentum or velocity of;
deaden a ship's headway
deaden (v.)
become lifeless, less lively, intense, or active; lose life, force, or vigor;
deaden (v.)
make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation;
deaden a sound
Synonyms: blunt
deaden (v.)
convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil;
From wordnet.princeton.edu