Fun

Fun is defined by the Oxford English Dictionary as "light-hearted pleasure, enjoyment, or amusement; boisterous joviality or merrymaking; entertainment".... Although its etymology is uncertain,[1] it has been speculated that it may be derived from Middle English fonne (fool) and fonnen (the one fooling the other).[3] An 18th-century meaning (still used in Orkney and Shetland[1]) was "cheat, trick, hoax", (trickster) a meaning still retained in the phrase "to make fun of"... According to Johan Huizinga, fun is "an absolutely primary category of life, familiar to everybody at a glance right down to the animal level. https://en.wikipedia.org/wiki/Fun

cf playful?