1) Carelessness 2) Flaccidity 3) Laxity 4) Neglect 1) Looseness 2) Play 3) Slack 
Slackness refers to vulgarity in West Indian culture, behavior and the music. It also refers to a subgenre of dancehall music with straightforward sexual lyrics performed live or recorded. Its form and pronunciation varies throughout the Caribbean. With the decline of roots reggae music, sound systems regained popularity. DJs performed over extend...
• (n.) The quality or state of being slack.
Slack'ness noun The quality or state of being slack.