Slack - The word is elsewhere translated as “deceitful” Job 13:7; Psalms 120:2-3; Hosea 7:16; Jeremiah 48:10. The two thoughts run easily into each other.
Related Commentaries of Proverbs 10:4
Proverbs 10:4
4 He becometh poor that dealeth with a slack hand: but the hand of the diligent maketh rich.