The Collaborative International Dictionary of English v.0.48:
Serio-comic \Se`ri*o-com"ic\, Serio-comical \Se`ri*o-com"ic*al\, a. Having a mixture of seriousness and sport; serious and comical. [1913 Webster]WordNet (r) 3.0 (2006):
seriocomic adj 1: mixing the serious with the comic with comic predominating; "a seriocomic novel" [syn: seriocomic, seriocomical]