FACETIOUS

playful

humorous

cleverly amusing in tone
"facetious remarks"

SYN - bantering, tongue-in-cheek

"He didn't like the way he spoke facetiously about such a serious manner."

"I don't know why he took me so seriously, couldn't he tell i was being facetious?"

"She meant come off as facetious, but it just wasn't that funny or playful and the topic they spoke of demanded more seriousness."

"She did not feel comfortable with his facetious manner and wanted to get away from the situation."