What’s the difference between upset and uneasy? They all use here to describe emotion.
The two words come from the novel Flipped. The original sentence is that I realized that upset has been overshadowed by uneasy.

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Answer

Uneasy has the sense of of expectation. It is weaker than being upset. It is a feeling that something bad might happen. Something that might upset you might happen.

To be upset is kind of to have a general negative feeling: "a state of being unhappy, disappointed, or worried."