"unhappy, unlucky," 1754, from in- (1) "not, opposite of" + felicitous. Earlier was infelicious (1590s). Related: infelicitously; infelicitousness.
infelicitous phrasing
the infelicitous typesetting was due to illegible copy
an infelicitous remark
infelicitous circumstances
infect
infection
infectious
infective
infecund
infelicitous
infelicity
infer
inference
inferential
inferior
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