Backslider

//ˈbækslaɪdɚ// noun

Definitions

Noun
  1. 1
    A recidivist; one who backslides, especially in a religious sense; an apostate.

    "She married him thinking to change his ways, and for a while he got religion, but he was ever a backslider; she soon began finding bottles stashed about the house."

  2. 2
    someone who lapses into previous undesirable patterns of behavior wordnet
  3. 3
    One who will not do his work or shoulder his responsibilities. Ireland

Etymology

From backslide + -er.

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