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I found it gruntling.

Is that a dis?

That was good!

There's a term for that: unpaired word

If a 'rebuttal' is an "instance of rebutting evidence or an accusation" then 'butting' ought to be making the said accusation.

And it seems being 'whelmed' is already in common use, as a mediocre middle ground feeling between over and underwhelmed.

An industry trade show is (or at least was) called "Fenestration".