I’m not falling for that.
“Super-” as in “supercute” “supercool”
“Doublepluscute” would be doublepluscool!
Damn.
I’ll agree that copacetic, humongous and discombobulated are candy-ass words. Cutesy and on a level with a winking smilies. 
Still, there are times when a cutesy, candy-ass word is what’s called for, so I can’t wish for their non-existence.
Another candy-ass word is “curmudgeon”. If someone is truly a curmudgeon then using such a cutesy word to describe them would be counter-productive. Likewise, anyone who refers to themself as a curmudgeon isn’t one.
Hooray! You win!
What words do you believe to be exactly synonymous with those two?
There are subtle gradations of denotation and connotations between many synonym pairs; almost never are the meanings exactly the same. Even when the meanings are very close – talk & speak, for instance, or little/small, big/large – there’s a virtue to having more and less formal terms to use.
At a Christmas gathering at my parents’ place right now… my aunts just pointed out that supposedly my other aunt (who isn’t here) uses the word ‘copacetic’ a lot. As in, All. The. Time. I personally use it once a year or so, when it fits the circumstances. Nothing wrong with limited usage IMHO.
On a side note, without the word ‘copacetic’, the world would never have heard of the band Local H. Just throwing that out there.
This is the song he’s talking about, in case you’ve never heard it.
I cannot wait to hear someone refer to generosity as “bigesse”.
Curmudgeon is yet another word that sounds like exactly what it is, which I love.
What about nonplussed? While one can be nonplussed, can one be plussed?
Another one that is challenging to use in a sentence is “pluperfect”. Without looking it up - who can use it in a sentence?
“I wish I had understood the meaning of the pluperfect tense when I really needed it on that test.”
I had learned to cook a pluperfect turkey before Christmas came around.
(I think the tense is right)