"incredubility" -- an aggcorn, or a blend, or what?

[Joel S. Berson]

On an email list, a book indexer and I think former copy editor has written:

As disarming as the host's incredubility about indexers being
"separate people," it sure set up Tina Brown's response.  [For the
wondering, a reference to a recent NPR program about ebooks.]

I suppose "incredulity" mixed up with "dubiety".

Joel

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