‖ accidia [a. med.L. accīdia(see accidie).] = accidie. 1930Time & Tide 28 Mar. 414/2 Half of them suffer from the deadly spiritual disease of accidia.1947C. Gray Contingencies iii. 89 The combination of medieval accidia and modern weltschmerz, which we find in his [Liszt's]Hamlet.