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Synonyms for Unhappy (same or very similar meaning)

WordNet sense 1 (very unhappy; full of misery):
miserable, wretched

WordNet sense 2 (marked by or producing unhappiness):
infelicitous

WordNet sense 3 (not favored by fortune; marked or accompanied by or resulting in ill fortune):
unfortunate

WordNet sense 4 (generalized feeling of distress):
distressed, dysphoric


From the ODE community, based on WordNetadd/edit