Wiktionary
adv. In a way that is infelicitous or unfortunate
WordNet
adv. in an infelicitous manner; "he chose his words rather infelicitously" [ant: felicitously]
Usage examples of "infelicitously".
Could he give felicity who was so infelicitously worshipped, and who, unless he should be thus worshipped, was yet more infelicitously provoked to anger?
He favoured me with a catalogue of the serviced he had rendered to the country, adding, a trifle infelicitously, I felt, a list of the distinguished persons whom he had -- as he regrettably put it -- forced to play ball with him.
The problem, as you so infelicitously put it --" (Here a needle-toothed leer spread itself over Wellcome's face, a grimace for a dyspeptic possum to envy.
That she had played the part of one, however, was made plain by the faint odor of onions still clinging to her and mixing rather infelicitously with the richer and pleasanter odor of the limo's interior.