The quality or state of being baleful; the characteristic of being menacing, harmful, or evil in appearance or intent.
From 'baleful' plus the suffix '-ness,' creating an abstract noun for describing the essence of something evil or threatening.
This word perfectly captures that shiver you get from a scary look—'balefulness' is the abstract essence of doom radiating from someone's face, which is why it sounds so deliciously spooky!
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