Unhappy, unsatisfied, upset, unaware, and unintelligent are all things that people can feel that start with "u". Although, it seems to me that only unhappy, upset, and unsatisfied can be classified as emotions.
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unhappy
Kleptomaniac.
Uncertainty, uneasiness, unhappy and upset are emotions that begin with the letter u.
Betrayed, bitter, boastful, bored and bubbly are emotions. They begin with the letter b.
Vengeful and vicious are emotions.
sad
Grief, gratitude, guilt, and greed are emotions that begin with the letter G.
zippy
emotions
Happy
jealousy, joyful
adjectives that begin with the letter U areuglyunctuousunderratedundiplomaticunbelievableunstoppableurgentusefuluselessuncomfortableUltraUltraconservativeUltramarineUltramodernUmberUmbilicalUnitedUniversalUnjustUnkindUnknowingUnknownUnlawfulUnlikeUnlikelyUnluckyUnlimited
Cheerful, cautious, cocky, compassionate, concerned, confident, confused, courageous, cowardly, cranky, curious and cynic are emotions. They begin with the letter c.