Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
deadened is an adjective meaning "devoid of physical sensation; numb". It carries 2 recorded senses.
devoid of physical sensation; numb
“his gums were dead from the novocain”
“she felt no discomfort as the dentist drilled her deadened tooth”
“a public desensitized by continuous television coverage of atrocities”
Definitions, synonyms and semantic relations for deadened come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.