开玩笑地，诙谐地
intended as a joke and not said seriously
I only said it in jest - you're obviously not fat. 我那么说是开玩笑——很显然，你不胖。
He insisted that his remarks had been made in jest.
The radio station argued that these comments were clearly said in jest.
When he talks about his own genius, it's only half in jest.
If you say anything threatening, even in jest, you will face strict punishment.
See also: jest noun