Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: sleac

slack

1 adjective
     
slack1
1 hanging loosely, or not pulled tight [≠ taut]:
Keep the rope slack until I tell you to pull it.
2 with less business activity than usual:
Business remained slack throughout the day.
3 not taking enough care or making enough effort to do things correctly - used to show disapproval:
Slack defending by Real Madrid allowed Manchester United to score.
—slackly adverb
—slackness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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