Question

Comparative form of fun

Answer 1

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$\huge\text{Fun..!!}$


The only correct comparative form of the adjective fun is:

$\bold{=>\:More\:fun}$

$\bold{=>\:Most\:fun}$


$\sf{\underline{And,}}$

That funner and funnest are only appropriate in the most informal contexts.


$\sf{\underline{Now,\:coming\:to\:the\:fact:}}$

The reason the use of funner and funnest has been discouraged is that..

=> Fun was until recently only a $\bold{noun.}$


As a noun, its quantity or amount would be compared with:

$\sf{=>\:'The\:more'}$

$\sf{=>\:'The\:most'}$


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Answer 2

$\bold{Answer}$

The only correct comparative form of the adjective fun is:

More fun 

Most fun 

And, 

That funner and funnest are only appropriate in the most informal contexts.

Now,comingtothefact: 

The reason the use of funner and funnest has been discouraged is that.. 

=> Fun was until recently only

a  noun.