When I first saw the word in your subject line I thought of the "without content" meaning. The "discontented" meaning is not very familiar to me, and in a quick scan of various search results I could find no examples of its use in that sense. I wonder if it may be an old meaning.
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Anonymoushttp://www.thefreedictionary.com/contentlessThis entry is copied from an old 1913 dictionary (a favourite with some websites as it is out of copyright). Wiktionary also lists the "discontented" meaning (