Slackhe will not be slack to him that hateth him, Deut. 7:10.vow … thou shalt not slack to pay it, Deut. 23:21.How long are ye slack to go to possess the land, Josh. 18:3.becometh poor that dealeth with a slack hand, Prov. 10:4.Therefore the law is slacked, Hab. 1:4.Let not thine hands be slack, Zeph. 3:16.Lord is not slack concerning his promise, 2 Pet. 3:9.my strength slacken, because of mine afflictions, 2 Ne. 4:26.Have I slackened mine hand, Jacob 5:47.