Definition of "unwontedly"

“Knowest thou,” said the Jester, “my good friend Gurth, that thou art strangely courteous and most unwontedly pious on this summer morning? […] ”

1820, Walter Scott, chapter 6, in Ivanhoe‎

Yes. I remember Adlestrop—The name, because one afternoonOf heat the express-train drew up thereUnwontedly. It was late June.

1917, Edward Thomas, “Adlestrop”, in Poems, London: Selwyn & Blount, page 40