'Slack' in the Bible

And Joshua said to the children of Israel, How long will ye shew yourselves slack to go to take possession of the land which Jehovah the God of your fathers hath given you?

Then she saddled the ass, and said to her servant, Drive and go forward; slack not the riding for me, except I bid thee.

He cometh to want that dealeth with a slack hand; but the hand of the diligent maketh rich.

In that day it shall be said to Jerusalem, Fear not; Zion, let not thy hands be slack.