The word "nonstop" means continuously without interruption or stopping. It is an adjective that describes something that happens, continues to happen, or operates without any breaks or stoppages in between.
Usage examples
The plane flew nonstop from New York to Los Angeles.
She worked nonstop for three days to meet the deadline.
The party went on nonstop until the early hours of the morning.
We drove nonstop for twelve hours to reach our destination.
The baby cried nonstop during the entire car ride.