In a tedious or dull manner; in a way that causes boredom or disinterest.
Adverbial form of 'boresome' created with the '-ly' suffix, following standard English derivation patterns for forming adverbs from adjectives.
The need for this adverb reveals how English speakers felt about repetitive tasks—they didn't just want to say something was boring, they wanted to describe the tedious experience of enduring it.
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