slow

"The slow in our class struggled to keep up with the assignments. "

"The slow on the playlist made everyone feel relaxed. "

"To slow down the traffic, the police officer signaled for the cars to reduce their speed. "

"The heavy rain slowed the children's walk to school. "

"The car slowed down as it approached the school zone. "

"a slow train;  a slow computer"

"The project's completion was slow; it took several months instead of weeks. "

"My grandfather is a slow learner, so it takes him longer to understand new concepts in his history class. "

"My grandmother drove very slowly through the town, carefully watching for children crossing the street. "

"That clock is slow."

"The student's presentation was slow; she lacked enthusiasm and her delivery was not brisk. "

"The summer break was slow; there weren't many activities planned. "

"That clock is running slow."