Banefulnesses, which refers to the quality of being harmful or destructive, can be described using a variety of synonyms. One such synonym is "perniciousness," which denotes the ability to cause gradual harm or damage. Another synonym is "virulence," which conveys the idea of being extremely poisonous or infectious. "Toxicity" is also a suitable synonym, particularly when referring to the presence of harmful substances. Other possible synonyms for banefulnesses include "noxiousness," "noxiousness," and "malignancy," all of which express the idea of causing damage or harm in some way. Regardless of which word is chosen, the underlying sense is the same: banefulnesses suggests a destructive or harmful quality that should be avoided wherever possible.