The quality or state of being tedious, dull, and uninteresting.
Noun form created from 'boresome' with the abstract noun suffix '-ness', allowing speakers to refer to boredom as a measurable property or condition.
Creating abstract nouns with '-ness' was so productive in English that speakers could instantly convert almost any descriptor into a noun—the boresomeness of waiting feels very different from 'boring waiting' because it names the quality itself.
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