WordWeb Online

1. Weakness characterized by a lack of vitality or energy
   - inanition, lassitude, lethargy
    
2. The quality of being loose (not taut)
   "he hadn't counted on the slackness of the rope"
   - slack
    
3. The quality of being lax and neglectful
   - laxness, laxity, remissness

Derived forms: slacknesses

See also: slack

Type of: looseness, neglect, neglectfulness, negligence, play, weakness

Encyclopedia: Slackness