continuing without pause or interruption
incessant - constant
The term ‘incessant’ is typically used to describe something relentlessly annoying or unpleasant such as loud noises, somebody talking too much, or bad weather.
Living next to such a big factory is not easy. The noise is incessant.
I hate sitting next to Pauline at lunch. She just talks incessantly!
I was hoping to go for a walk but it has been raining incessantly all day.