That is correct, funner is not a word, but I really think it should be. If we have fun, then we are having fun. But I think the next level in having fun should be labeled as ‘funner’, not just ‘more fun’. To say “That was more fun” sounds bland to me, almost apologetic. Then we have funnier which is a word. To me funnier doesn’t sound anymore strange than funner.
Just now I looked up the word fun and found a new form of the word that I was not even aware. Funned. Now that sounds strange to me! You could be funned, or as we know it today – punked.
Etymology study is fascinating. Our spoken words have had to come from somewhere, and we often find that word origin and it’s pronunciation is not what we had expected.
This is what I found on the origin of Fun: late 17 century (denoting trick or hoax): from obsolete fun ‘to cheat or hoax’, dialect variant of late Middle English fon ‘make fool of, be a fool’, related to fon ‘a fool’, of unknown origin.
Usage: The use of fun as an adjective meaning ‘enjoyable’, as in we had a fun evening, is now established in informal use, although not accepted in standard English. The comparative and superlative forms funner and funnest, formed as if fun were a standard adjective, should only be used in very informal contexts, typically speech.
I was surprised to learn the informal acceptance for usage of funner to be somewhat accepted, albeit prefaced that is should only be used in very informal settings. Note to self: Do not use the word funner during any formal presentations or speeches while addressing an audience. I guess this means that if I were to use the word funner, I should only use it in context of my friends and family. This way, everyone could tilt their head in confusion and laugh along with me, as I am simply having fun.