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Use "harmfulness" in a sentence
"He has an interesting perspective to say the least, but Jimmy schools the good doctor on several points (such as the alleged "harmfulness" of saturated fat and the dangers of consuming "too much protein" following a low-carb diet)."
"Dr. Brady  believes that the so-called harmfulness of coffee is mainly psychological, as evidenced by his expression, "Most of the prejudice which exists against coffee as a beverage is based upon nothing more than morbid fancy."
"The furious opposition triggered by gun control efforts flows directly out of what can only be called a religious fervor for empowerment, which is resistant to all logic on the harmfulness of widespread gun availability or the ineffectiveness of violent conflict resolution."