noun
a disappointing or unpleasant situation or event
adjective
used to describe something that is disappointing or unfortunate
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It was quite a bummer that the project got delayed due to unforeseen circumstances.
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I can't believe we missed the bus, what a bummer!
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Losing my phone right before the trip was a total bummer.
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Ending the relationship was a bummer, but it was necessary for my well-being.