'Slack' in the Bible
and repays him that hates him to his face, to destroy him; he will not be slack to him that hates him; he will repay him to his face.
And the men of Gibeon sent unto Joshua to the camp to Gilgal, saying, Slack not thy hand from thy slaves; come up to us quickly and save us and help us, for all the kings of the Amorites that dwell in the mountains are gathered together against us.
Then she caused the ass to be saddled and said to her servant, Lead and go forward; slack not the pace for me except I bid thee.
He that deals with a slack hand becomes poor, but the hand of the diligent makes rich.
If thou art slack in the day of tribulation, thy strength shall be reduced.