The Collaborative International Dictionary of English v.0.48:
Jestingly \Jest"ing*ly\, adv. In a jesting manner. [1913 Webster]WordNet (r) 3.0 (2006):
jestingly adv 1: in jest; "I asked him jokingly whether he thought he could drive the Calcutta-Peshawar express" [syn: jokingly, jestingly]