Is this your crossword clue?
"unhappiness" is also used as a crossword clue. If that's what you saw, the answer is often dissatisfaction (15 letters).
Definitions
emotions experienced when not in a state of well-being
Word origin
From unhappy + -ness or un- + happiness.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Sorrowful state”11 letters
02“Sad mood”11 letters
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U__________