The lecture was deadly dull, and I went to sleep.
•Her story was really deadly dull. I am sorry I was awake for part of it.
Смотреть больше слов в «Dictionary of American idioms»
deadly dull adj infml The lecture was deadly dull На лекции была такая скука, что мухи дохли
adj infml The lecture was deadly dull — На лекции была такая скука, что мухи дохли