dead·en 
/ˈdɛdn̩/ verb
dead·ens; dead·ened; dead·en·ing /ˈdɛdn̩/ verb [+ obj] : to make (something) weaker or less noticeable
▪ All the different perfumes deadened [=dulled] her sense of smell. ▪ He took aspirin to deaden the pain. ▪ The new insulation will help to deaden the noise from the street outside.
▪ All the different perfumes deadened [=dulled] her sense of smell. ▪ He took aspirin to deaden the pain. ▪ The new insulation will help to deaden the noise from the street outside.
— deadening adjective [more deadening; most deadening]
▪ All the different perfumes had a deadening effect on her sense of smell.
▪ All the different perfumes had a deadening effect on her sense of smell.
