In a way that causes damage or harm; in a manner that is injurious or destructive.
From the present participle 'damaging' plus the adverbial suffix '-ly', which converts adjectives and participles into adverbs describing manner or method.
The word 'damagingly' helps us distinguish between accidental harm and harmful intent—you might step on someone's foot accidentally but damagingly in a way that suggests carelessness, capturing that middle ground between accident and malice.
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