Lewis Short
(adverb) : ĭn-opportūnus
* Unfitting (late Lat.), Oros. c. Pelag. p. 618 (also a false reading in two places for importunus, Cic. de Or. 2, 5, 20; 3, 5, 18). — Hence, ĭnopportūnē, , unsuitably, untimely, Aug. c. Faust. 22, 72.
Charlton T. Lewis, Charles Short, A Latin Dictionary