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Synonyms for Infelicitous (same or very similar meaning)

WordNet sense 1 (marked by or producing unhappiness):
unhappy

WordNet sense 2 (not favored by fortune; marked or accompanied by or resulting in ill fortune):
unfortunate

WordNet sense 3 (not elegant or graceful in expression):
awkward, inept


From the ODE community, based on WordNetadd/edit