SLACK'NESS, n.
1. Looseness the state opposite to tension not tightness or rigidness as the slackness of a cord or rope.
2. Remissness negligence inattention as the slackness of men in business or duty slackness in the performance of engagements.
3. Slowness tardiness want of tendency as the slackness of flesh to heal.
4. Weakness not intenseness.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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