1After a few months of intense work, the team felt slack and needed a break to recharge.
2The company's sales were slack during the winter months, but picked up again in the spring.
3He's been feeling slack all week, and hasn't gotten much work done.
4The economy experienced a slack period after the recession, but has since recovered.
5The teacher noticed that her students were slack during the lesson, and decided to try a new approach to engage them.