“The glutton, who is a notorious backslider when it comes to curbing his appetite, is more than likely a notorious backslider and procrastinator in the area of jogging as well.”
“Zeke Bassett and the rest have been finding fault with her and calling her a backslider.”
“Let the rationalists deal with the backslider who now confesses.”
backsliding
An occasion on which one backslides, especially in a moral sense