In a hazardous manner; in a way that is risky, dangerous, or fraught with peril.
From 'hazardous' (hazard + -ous) plus the adverbial suffix '-ly,' converting the adjective into an adverb modifying verbs and actions.
English adverbs typically add '-ly' to adjectives, but this wasn't always true—Old English used different endings, showing how English grammar simplified over centuries by standardizing on this one powerful suffix.
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