noun
a person who is perceived as dull, gloomy, or lacking in energy or enthusiasm
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The manager described him as a sad sack due to his constant negative attitude.
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Don't be such a sad sack, cheer up and enjoy the party!
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He's always moping around like a sad sack, it's so annoying.
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Her old stuffed animal looked like a sad sack with its worn-out fur and droopy eyes.