Lewis Short
(adjective) : immĕdĭtātus (inm-), a, um, inmeditatus
* Unstudied, unpremeditated, artless, natural (post-class.): sonores animalium,App. Flor. p. 357, 41: incessus,id. Met. 2, p. 115, 25.—Adv.: immĕdĭtātē, without premeditation, Gell. praef. § 10.
Charlton T. Lewis, Charles Short, A Latin Dictionary