boring
UK: ˈbɔːrɪŋ | US: ˈbɔːrɪŋ
adj. causing weariness or lack of interest; dull or tedious
v. present participle of "bore" (to make a hole or passage)
The adjective "boring" derives from the verb "bore," which originally meant "to pierce or drill" (Old English borian). By the 18th century, "bore" metaphorically extended to mean "to weary by monotony," likening repetitive drilling to tiresome behavior. The suffix "-ing" forms the present participle, here nominalizing the action into a state of causing dullness.
The lecture was so boring that half the audience fell asleep.
She avoided boring tasks by delegating them to her team.
His boring stories made the dinner feel endless.
The machine is boring holes into the metal plate.
They complained about the boring weather during the trip.