Fun Definition

fŭn

funned, funning, funs

noun

funs

Lively, joyous play or playfulness; amusement, sport, recreation, etc.

Webster's New World

Enjoyment or pleasure.

Webster's New World

A source or cause of amusement or merriment, as an amusing person or thing.

Webster's New World

Wiktionary

Synonyms:

Antonyms:

verb

funned, funning, funs

To have or make fun; play or joke.

Webster's New World

To tease or speak playfully to.

American Heritage

Synonyms:

adjective

Intended for, or giving, pleasure or amusement.

A fun gift.

Webster's New World

Enjoyable; amusing.

American Heritage

Antonyms:

idiom

for

American Heritage

for fun

Webster's New World

like fun!

Webster's New World

make fun of

Webster's New World

Idioms, Phrasal Verbs Related to Fun

Alternative etymology connects Middle English fonne to Old Frisian fonna, fone, fomne, variant forms of Old Frisian fāmne, fēmne (“young woman, virgin”), from Proto-Germanic *faimnijǭ (“maiden”), from Proto-Indo-European *peymen- (“girl”), *poymen- (“breast milk”). If so, then cognate with Old English fǣmne (“maid, virgin, damsel, bride”), West Frisian famke (“girl”), Eastern Frisian fone, fon (“woman, maid, servant," also "weakling, simpleton”).

From Wiktionary
From Middle English fon, fonne (“foolish, simple, silly”), probably of North Germanic origin, related to Swedish fånig (“foolish”), Swedish fåne (“a fool”). Compare also Norwegian fomme, fume (“a fool”). More at fon.

From Wiktionary
Possibly from fon to make a fool of from Middle English fonnen to fool possibly from fonne fool

From American Heritage Dictionary of the English Language, 5th Edition