The characteristic or quality of being forceful(noun)
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Use "forcefulness" in a sentence
"Vindication, according to Thomas Aquinas the translation of vindicatio as 'vengeance' is not particularly good, but it does a little better than 'vindication' at indicating the forcefulness the Latin word conveys, is an important virtue associated with justice."
""There is a passion, there is a vigor, there is a forcefulness, which is more thrilling," he says of an all-male Glee Club."
"The people were spoiled by the ramapant abuse of power under Bush and expected the same kind of forcefulness from Obama."