The verb repine describes expressing gloom or discontent. Brooding, fretful, and sad — these are the traits of people who repine at their circumstances in life.
Early American poet Anne Bradstreet used repine in her well-known poem, "Upon the Burning of Our House July 10th 1666," describing how the speaker got over the loss: "And when I could no longer look, / I blest His grace that gave and took, / That laid my goods now in the dust. / Yea, so it was, and so 'twas just. / It was his own; it was not mine. / Far be it that I should repine."