When you are having fun, you are having a good time. Watching little kids jump around inside an inflatable bouncy house, you can instantly tell how much fun they're having.

There is no mistaking fun when you're having it, and it's generally used to mean exactly what it sounds like, some activity or experience that's purely enjoyable. When fun takes the form of an adjective, it's informal, not strictly grammatically correct. So while you can say, "Being with her is so much fun," you can't correctly say, "She is such a fun girl." Fun turns a little bit mean when you're making fun of, or teasing, your friend. In this case, it might be fun for you, but it's probably not very much fun for him.

Primary Meanings of fun

activities that are enjoyable or amusing
violent and excited activity
Full Definitions of fun

n activities that are enjoyable or amusing

“I do it for the fun of it”
“he is fun to have around”
merriment, playfulness
Type of:
diversion, recreation
an activity that diverts or amuses or stimulates

n a disposition to find (or make) causes for amusement

“he was fun to be with”
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playful humor
archness, impertinence, perkiness, pertness, sauciness
inappropriate playfulness
friskiness, frolicsomeness, sportiveness
lively high-spirited playfulness
impishness, mischievousness, puckishness, whimsicality
the trait of behaving like an imp
humor, humour, sense of humor, sense of humour
the trait of appreciating (and being able to express) the humorous
Type of:
frivolity, frivolousness
the trait of being frivolous; not serious or sensible

n verbal wit or mockery (often at another's expense but not to be taken seriously)

“he became a figure of fun
play, sport
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jocosity, jocularity
fun characterized by humor
waggery, waggishness
waggish behavior
clowning, comedy, drollery, funniness
a comic incident or series of incidents
paronomasia, pun, punning, wordplay
a humorous play on words
Type of:
humor, humour, wit, witticism, wittiness
a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter

n violent and excited activity

“she asked for money and then the fun began”
“they began to fight like fun
Type of:
any specific behavior

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