KJV Dictionary Definition: slack
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.
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.