Waggish, a. — Webster enters it under “waggish”
1. Like a wag; mischievous in sport; roguish in merriment or good humor; frolicsome. "A company of waggish boys." L'Estrange.
2. Done, made, or laid in waggery or for sport; sportive; humorous; as, a waggish trick. -- Wag"gish*ly, adv. -- Wag"gish*ness, n.
Shades of meaning
Fernald has no entry of its own for waggishness; he lists it under wit.
He lists it without comment; the entries above explain its neighbors.