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fun (EN)
noun, adjective

noun “fun”

fun, singular only
  1. the feeling of being happy and enjoying yourself
    Playing board games with friends on a rainy day is always a lot of fun.

adjective “fun”

base form fun (more/most)
  1. something that you find enjoyable and makes you happy
    The game was so fun that we didn't want to stop playing.
  2. something that is designed to entertain and provide enjoyment
    The carnival was so fun with all the rides and games.