jocoserious

a. (jō`kō̍*sē"rĭ*Ŭs)

[Jocose + serious.]
Mingling mirth and seriousness. M. Green.

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combining jocular and serious matters
"Was the guest conscious of and did he acknowledge these marks of hospitality? His attention was directed to them by his host jocosely, and he accepted them seriously as they drank in jocoserious silence Epps's massproduct, the creature cocoa." - James Joyce, Ulysses