I don't want to disagree with you for the sake of it, but the threshold in the US for "originality" is very low. For example, creating a list with some non-deterministic ordering would be enough. For a dictionary, the definitions of the words would clearly be original work.
There's a decent wikipedia article on this I'd recommend you read. It's fascinating: http://en.wikipedia.org/wiki/Threshold_of_originality - one example cited in that article is a newspaper in the UK which asserted copyright on a speech they had transcribed and published - based on the amount of work which had gone into the transcription.
So while "maybe" is still the right answer, in this particular case, I would not bet on any court deciding that a Hunspell dictionary is not copyrightable.
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