IDIOMS

lost soul

(idiomatic) One who is forlorn, who lacks direction, purpose, or motivation in life.

Example: 1847, Emily Brontë, Wuthering Heights, ch. 11:
  "Well, I won't repeat my offer of a wife: it is as bad as offering Satan a lost soul."
1869, Charles Kingsley, The Hermits, ch. 11:
  St. Malo, seized with pity for the lost soul of the heathen, opens the mound and raises the dead to life.
1906, Upton Sinclair, The Jungle, ch. 10:
  Of course she stopped paying her dues to the union. She lost all interest in the union. . . . She had about made up her mind that she was a lost soul.
1946 Oct. 7, "Books: The Fall of Valor," Time (retrieved 5 May 2015):
  Charles Jackson's first novel, The Lost Weekend, was the story of five days in the life of a lost soul, Don Birnam, a confirmed and hopeless alcoholic.