• WordNet 3.6
    • n discontentedness a longing for something better than the present situation
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Century Dictionary and Cyclopedia
    • n discontentedness Uneasiness of mind; inquietude; dissatisfaction.
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In literature:

From such an emptiness of the soul proceed unrest, discontentedness, nay, innumerable faults!
"The Home" by Fredrika Bremer
There like thou wast to be thrown overboard In every storm of discontentedness.
"A Life of William Shakespeare with portraits and facsimiles" by Sidney Lee