[ fuhn ]
See synonyms for: funfunnedfunning on

  1. something that provides mirth or amusement: A picnic would be fun.

  2. enjoyment or playfulness: She's full of fun.

verb (used with or without object),funned, fun·ning,
  1. Informal. joke; kid.

adjective,fun·ner, fun·nest.
  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 about fun

  1. for / in fun, as a joke; not seriously; playfully: His insults were only in fun.

  2. like fun, Informal. certainly not; of doubtful truth: He told us that he finished the exam in an hour. Like fun he did!

  1. make fun of, to make the object of ridicule; deride: The youngsters made fun of their teacher.

Origin of fun

First recorded in 1675–85; dialectal variant of obsolete fon “to befool”; see fond1

Other words for fun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use fun in a sentence

British Dictionary definitions for fun


/ (fʌn) /

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

  2. pleasure, gaiety, or merriment

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

  2. fun and games facetious, ironic amusement; frivolous activity

  3. like fun informal

    • (adverb) quickly; vigorously

    • (interjection) not at all! certainly not!

  4. make fun of or poke fun at to ridicule or deride

  5. (modifier) full of amusement, diversion, gaiety, etc: a fun sport

verbfuns, funning or funned
  1. (intr) informal to act in a joking or sporting manner

Origin of fun

C17: perhaps from obsolete fon to make a fool of; see fond 1

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

Other Idioms and Phrases with fun


In addition to the idiom beginning with fun

  • fun and games
  • funny bone
  • funny business
  • funny money

also see:

  • for fun
  • like fun
  • make fun of
  • more fun than a barrel of monkeys

Also see underfunny.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.