American Heritage Dictionary
(2)
Century Dictionary
(1)
GNU Webster's 1913
WordNet
(3)
Elsewhere on the web
She was wearing something unfathomable - 'roman' style - purple thing, but both my friends liked it.
It seems unfathomable-nearly three dozen terrorist training compounds in the U.S. and the FBI, Homeland Security, and State Department are no help at all?— Refugee Resettlement Watch
Its not that any other career is unfathomable (I think it is just a rhetorical trick to say otherwise - for everyone, there are several careers you could be satisfied with and perhaps grow to enjoy) its just that everything else seems so clearly inferior.— The Austrian Economists

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