Definition of "jocosely"

Mr. Hurst interrupted, 'to have his name mixed up with shady people, as Ormond says; so, my dear! the long and short of it is, you must refuse her invitation to go there on this visit!' 'But I have accepted it.' 'Unaccept it then,' jocosely.

1880, Mrs. Harry Bennett-Edwards, In Sheep's Clothing‎, volume 2, page 154