Wiki article on this topic: Fun is the enjoyment of pleasure, particularly in leisure activities. Fun is an experience often unexpected, informal or purposeless. It is an enjoyable distraction, diverting the mind and body from any serious task or contributing an extra dimension to it. Although particularly associated with recreation and play, fun may be encountered during work, social functions, and even seemingly mundane activities of daily living. It may often have little to no logical basis, and opinions on whether an activity is fun may differ from person to person. A distinction between enjoyment and fun is difficult but possible to articulate, fun being a more spontaneous, playful, or active event. There are psychological and physiological implications to the experience of fun. Modern Westernized civilizations prioritize fun as an external and sexual aspect.
The word fun is associated with sports, sexual activity, entertaining media, high merriment, and amusement. Although its etymology is uncertain, it may be derived from fonne and fonnen. Its meaning in 1727 was "cheat, trick, hoax", a meaning still retained in the phrase "to make fun of".
The landlady was going to reply, but was prevented by the peace-making sergeant, sorely to the displeasure of Partridge, who was a great lover of what is called fun, and a great promoter of those harmless quarrels which tend rather to the production of comical than tragical incidents.
Henry Fielding, The History of Tom Jones, a Foundling
The way the word fun is used demonstrates its distinctive elusiveness and happiness. Expressions such as "Have fun!" and "That was fun!" indicate that fun is pleasant, personal, and to some extent unpredictable. Expressions such as "I was making fun of myself" convey the sense that fun is something that can be amusing and not to be taken seriously. The adjective "funny" has two meanings which often need to be clarified between a speaker and listener. One meaning is "amusing, jocular, droll" and the other meaning is "odd, quirky, peculiar". These differences indicate the evanescent and experiential nature of fun and the difficulty of distinguishing "fun" from "enjoyment".