Mind-numbing (adjective)

Making the mind feel numb, dull, or deadened, often due to boredom or monotony.

Origin:

The term 'mind-numbing' is thought to have originated in the mid-20th century, and is a compound of 'mind' and 'numbing', meaning to deaden or dull the sensations of.

Examples:

1. The lecture was so mind-numbing that I fell asleep.
2. After hours of staring at the screen, his eyes felt tired and his brain was mind-numbing.
3. The monotonous sound of the engine was mind-numbing.
4. He found the political speeches mind-numbing.
5. She found the daily routine of her job to be mind-numbing.