feeling sad, displeased, or not satisfied; the opposite of happy.
Formed from the prefix 'un-' (meaning not) combined with 'happy.' The word 'happy' originally meant lucky or fortunate in Middle English, from Old Norse 'happ' meaning chance or fortune.
Interestingly, 'unhappy' often suggests a deeper dissatisfaction than just sadness—it can imply disapproval or unease about something, which is why people say 'I'm unhappy with this decision' rather than 'I'm sad with this decision.'
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