Having qualities traditionally ascribed to fun, such as excitement or laughing.
Archaic: in a funly manner.
Tim: What about the funliness factor?
Theodore: The level of funliness will be matched only by the level of manliness at the party, so grab your steel mits and whiskey.
Apparently not an actual word, funly is used to describe someone who does something in a fun way.
She teaches funly.