'Leanness' in the Bible

Therefore shall the Lord, Jehovah of hosts, send among his fat ones leanness, and under his glory he shall kindle a burning, like the burning of a fire:

From the end of the earth have we heard songs: Glory to the righteous! And I said, My leanness, my leanness, woe unto me! The treacherous have dealt treacherously; yea, the treacherous have dealt very treacherously.