IPA: /ˈbeɪlfəl.nəs/
KK: /ˈbeɪlfəl/
The quality of being harmful or threatening; a feeling or expression of evil or danger.
The balefulness of his glare made everyone uneasy.
Balefulness → It is formed from "bale" (from Old English *bælg*, meaning evil or harm) and "-ful" (meaning full of) and "-ness" (meaning the state of). The word "balefulness" refers to the state of being full of harm or evil.
Think of 'bale' meaning harm, and when something is 'full of' that harm ('-ful'), it creates a state of being harmful ('-ness'). This helps you remember that balefulness means the state of being harmful or evil.