As an adjective boring describes something (or someone) that is tedious, dull, and lacking in interest. As a noun, boring refers to the act of drilling a hole, or the hole itself.

When a geologist's powerful drill makes a boring into the earth, you can remove a sample and learn about the history of our planet just by seeing what's contained in the boring's layers. Of course, if you aren't interested in that kind of thing, you might find a two-hour lecture on the subject a bit boring.

Definitions of boring
  1. adjective
    so lacking in interest as to cause mental weariness
    “a boring evening with uninteresting people”
    synonyms: deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome
    arousing no interest or attention or curiosity or excitement
  2. noun
    the act of drilling
    synonyms: drilling
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    type of:
    creating by removal
    the act of creating by removing something
  3. noun
    the act of drilling a hole in the earth in the hope of producing petroleum
    synonyms: drilling, oil production
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    type of:
    (economics) manufacturing or mining or growing something (usually in large quantities) for sale
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