modify,
alter,
change make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"
obtund reduce the edge or violence of; "obtunded reflexes"
petrify cause to become stonelike or stiff or dazed and stunned; "The horror petrified his feelings"; "Fear petrified her thinking"
deaden -
convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil
convert change in nature, purpose, or function; undergo a chemical change; "The substance converts to an acid"
chemical science,
chemistry the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
deaden -
become lifeless, less lively, intense, or active; lose life, force, or vigor
change undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night"
deaden -
lessen the momentum or velocity of; "deaden a ship's headway"
retard cause to move more slowly or operate at a slower rate; "This drug will retard your heart rate"
deaden -
make vapid or deprive of spirit; "deadened wine"
modify,
alter,
change make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"
deaden -
cut a girdle around so as to kill by interrupting the circulation of water and nutrients; "girdle the plant"