Rascally
Part of speech: adjective
Definition: Like a rascal.
Part of speech: adverb
Definition: In the manner of a rascal.
Playful
Part of speech: adjective
Definition: liking play, prone to play frequently, such as a child or kitten; rather sportive.funny, humorous, jesting, frolicsome.fun, recreational, not serious.experimental.
Example sentence: Humanity has advanced, when it has advanced, not because it has been sober, responsible, and cautious, but because it has been playful, rebellious, and immature.