Hebephrenic

Hebephrenic (he-bee-free-nic) Adjective.

Exhibiting adolescent silliness or silly behavior.

"Editors are prone to fits of hebephrenic behavior due to their lack of maturity."

Accismus

accismus (ak-SIZ-muhs) noun:
Showing no interest in something while secretly wanting it. It's a form of irony where one pretends indifference and refuses something while covertly desiring it.

"Though we really wanted to sign the bigshot author, we played it cool and affected nothing but accismus."