Home › Words › I › ineffectualnessineffectualnessineffectualness means inefficacy.EtymologyFrom ineffectual + -ness.nouninefficacye.g.“The ineffectualness of some men's devotion.” — a. 1737, William Wake, The genuine epistles of the apostolical fathers:Definitions & examples from Wiktionary (CC BY-SA 3.0).