Dictionary.com
Thesaurus.com
Synonyms

fun

American  
[fuhn] / fʌn /

noun

  1. something that provides mirth or amusement.

    A picnic would be fun.

    Synonyms:
    gaiety, play, pleasure, merriment
  2. enjoyment or playfulness.

    She's full of fun.

    Synonyms:
    gaiety, play, pleasure, merriment

verb (used with or without object)

funned, funning
  1. Informal. joke; kid.

adjective

funner, funnest
  1. Informal. of or relating to fun, especially to social fun.

    a fun thing to do; really a fun person; the funnest game.

  2. Informal. whimsical; flamboyant.

    The fashions this year are definitely on the fun side.

idioms

  1. for / in fun, as a joke; not seriously; playfully.

    His insults were only in fun.

  2. make fun of, to make the object of ridicule; deride.

    The youngsters made fun of their teacher.

  3. like fun, certainly not; of doubtful truth.

    He told us that he finished the exam in an hour. Like fun he did!

fun British  
/ fʌn /

noun

  1. a source of enjoyment, amusement, diversion, etc

  2. pleasure, gaiety, or merriment

  3. jest or sport (esp in the phrases in or for fun )

  4. facetious amusement; frivolous activity

  5. informal

    1. (adverb) quickly; vigorously

    2. (interjection) not at all! certainly not!

  6. to ridicule or deride

  7. (modifier) full of amusement, diversion, gaiety, etc

    a fun sport

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

verb

  1. informal (intr) to act in a joking or sporting manner

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
fun More Idioms  

    More idioms and phrases containing fun


Etymology

Origin of fun

First recorded in 1675–85; dialectal variant of obsolete fon “to befool”; fond 1 ( def. )

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It was basically a mock recruitment song for the CIA, poking fun at the damage the CIA has done around the world.

From Los Angeles Times

The Emmerdale star recalled how the pair shared "many, many happy times to begin with and together we did have so much fun".

From BBC

This is a logic puzzle my brain can’t quite solve—and not the fun kind of logic puzzle, either.

From Literature

“Though it’s really fun and satisfying and fulfilling,” Kim says, “my body gets destroyed.”

From The Wall Street Journal

The Frankenstein director is one of the only stars pulling a fun pose this year, with his outstretched arms making him the highlight of the front row.

From BBC