† eˈffectfull,a.Obs. In 6 Sc.effecf-. [f. effect + -full.] Effectual. 1555Sc. Acts Mary xviii, Our souerane Lady in her parliament..maid actis..quhilkis as yit hes tane na dew and effecfull execucion.1669Simpson Hydrol. Chym. 78 The effectful cause of direful diseases.