Per Wastberg said Dylan's lack of reaction was predictable but disrespectful nonetheless.
He was quoted telling the Swedish newspaper Dagens Nyheter in Saturday's edition, "One can say that it is impolite and arrogant. He is who he is."
Wastberg said the academy still hopes to communicate with the 75-year-old artist, whose award credits him with creating "new poetic expressions within the great American song tradition."
The academy says it has failed to reach Dylan since the award announcement October 13. It was mentioned on Dylan's official Twitter and Facebook accounts.
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