Bob Dylan has been labelled 'impolite and arrogant' for failing to acknowledge his Nobel Prize for Literature.
Dylan, 75, was surprisingly announced as the winner of the award last week - the first time it was awarded to someone primarily seen as a musician.
But the singer-songwriter has not spoken about the win in public or issued an official statement and the Swedish Academy said it has not been able to to reach Dylan since the award announcement on October 13.
One of the members of the panel that gave out the prize said Dylan's reaction was predictable but still disrespectful.
Per Wastberg told the Swedish newspaper Dagens Nyheter: "One can say that it is impolite and arrogant. He is who he is."
Mr Wastberg said the academy is still hoping to communicate with the artist, whose award credits him with creating "new poetic expressions within the great American song tradition".
The prize was mentioned on Dylan's official Twitter and Facebook accounts.
The honour will be officially conferred at a ceremony in Stockholm on December 10 but it is unclear whether Dylan will attend.