Definition of fun adjective from the Oxford Advanced Learner's Dictionary

  

fun

 adjective
adjective
BrE BrE//fʌn//
 
; NAmE NAmE//fʌn//
 
 
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 amusing or enjoyable She's really fun to be with. This game looks fun! There are lots of fun things for young people to do here. Word Origin late 17th cent. (denoting a trick or hoax): from obsolete fun ‘to cheat or hoax’, dialect variant of late Middle English fon ‘make a fool of, be a fool’, related to fon ‘a fool’, of unknown origin. Compare with fond.
See the Oxford Advanced American Dictionary entry: fun