SLACK, a.
1. Not tense not hard drawn not firmly extended as a slack rope slack rigging slack shrouds.
2. Weak remiss not holding fast as a slack hand.
3. Remiss backward not using due diligence not earnest or eager as slack in duty or service slack in business.
4. Not violent not rapid slow as a slack pace.
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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