In a burdensome manner; in a way that is heavy, oppressive, or creates unwanted responsibility.
From 'burdensome' plus the adverbial suffix '-ly,' which transforms adjectives into adverbs describing how an action is performed. This is the standard English method for creating adverbs.
Burdensomely shows the power of English's morphology—we can stack suffixes like building blocks: burden → burdensome → burdensomely, turning a noun into an adverb in just three steps!
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