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"unhappy" is also used as a crossword clue. If that's what you saw, the answer is often sad (3 letters).
Definitions
generalized feeling of distress
Word origin
From Middle English unhappy; equivalent to un- + happy.
Used in a sentence
“I am unhappy.”
“A moment of time may make us unhappy forever.”
“An unhappy customer is unlikely to return to your shop.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Sad”7 letters
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