The difference between Down in the dumps and Unhappy
When used as adjectives, down in the dumps means sad, whereas unhappy means not happy.
Unhappy is also noun with the meaning: an individual who is not happy.
check bellow for the other definitions of Down in the dumps and Unhappy
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Down in the dumps as an adjective (idiomatic):
Sad; lacking engagement or enthusiasm.
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Unhappy as an adjective:
Not happy; sad.
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Unhappy as an adjective:
Not satisfied; unsatisfied.
Examples:
"An unhappy customer is unlikely to return to your shop."
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Unhappy as an adjective (mostly, dated):
Not lucky; unlucky.
Examples:
"The doomed lovers must have been born under an unhappy star."
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Unhappy as an adjective (mostly, dated):
Not suitable; unsuitable.
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Unhappy as a noun:
An individual who is not happy.