Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

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, adv., unsuitably, untimely, Aug. c. Faust. 22, 72.