What's the difference between knavish and waggish?

Knavish

Definition:

(a.) Like or characteristic of a knave; given to knavery; trickish; fraudulent; dishonest; villainous; as, a knavish fellow, or a knavish trick.
(a.) Mischievous; roguish; waggish.

Example Sentences:

Definition:

(a.) Like a wag; mischievous in sport; roguish in merriment or good humor; frolicsome.
(a.) Done, made, or laid in waggery or for sport; sportive; humorous; as, a waggish trick.

Example Sentences:

(1) Perhaps the most damaging aspect of the allegations is the question of whether Hollande's trysts with what one newspaper waggishly called France's "second lady" have been funded out of the public purse.
(2) "We still love you, Roger," said one wag in the crowd - the low quality of waggishness is one thing which never changes at Wimbledon.
(3) Samsung’s special app for downloading the album crashed (leading a waggish commentator to observe that Jay-Z now had the round 100 problems).