1. The quality or state of being slack; lack of tightness or tension
The slackness in the rope made it unsafe to climb.
A frouxidão da corda a tornou insegura para escalar.
2. Lack of diligence, effort, or care; laziness or negligence
His slackness in completing the project frustrated his manager.
A negligência dele em completar o projeto frustrou seu gerente.
3. A period of reduced activity or business; slowness
There is a slackness in sales during winter months.
Há uma redução nas vendas durante os meses de inverno.