Definition of facetiousness:

part of speech: noun

Pleasantry; sportive humour.

Usage examples:

• But the genuine humourist sees something in that feature itself, as nature shaped it, to excite his facetiousness Mathilde Blind in "George Eliot".

• Beginning the old cumbrous facetiousness about her correspondence, he blurted out the true thoughts that he had begun to entertain. W. B. Maxwell in "The Devil's Garden".

• As soon as Dale went to order his gig the clumsy facetiousness was renewed. W. B. Maxwell in "The Devil's Garden".

• Mr. Ridgett continued talking in a tone of light facetiousness that seemed to cover a certain deprecating earnestness. W. B. Maxwell in "The Devil's Garden".