impropriateEtymologyFrom Medieval Latin impropriātus, past participle of impropriāre (“to take as one's own, appropriate”), from Latin in- + proprius (“one's own”).impropriate means of ecclesiastical property: placed under the control or management of a layperson. Lexicurio rates it Sui generis — a strength score of 87 out of 100.adjOf ecclesiastical property: placed under the control or management of a layperson.“Mrs. Ellen Gulſton, Relict of Theodore Gulſton, Doctor of Phyſick, a very Learned Man, being poſſeſſed of the Impropriate Parſonage of Bardvvell in Suffolk, did firſt procure from the King leave to annex the ſame to the Vicarage, and to make it Preſentative; and having formerly the Donation of the Vicarage, ſhe gave them both thus annexed freely to St. John’s College in Oxon: Expreſſing many Godly”verbTo appropriate for private use.“And for the Pardon of the rest, that had stood against the King; the King, upon a second advice, thought it not fit it should pass by Parliament, the better (being matter of Grace) to impropriate the Thanks to himself […]”In ecclesiastical law, to place (ecclesiastical property) under control or management of a layperson.