backslider

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backslider

One who reverts or relapses into bad habits, unethical or immoral behavior, or criminal activity. We've tried to help her quit smoking, but she's a bit of a backslider. Jimmy's too much of a backslider to stay true to the practices of the church.
References in periodicals archive ?
from extending a compliance schedule that backslides on a prior effluent
But this inching forward could easily turn into a backslide.
A tongue-in-cheek guest appearance on Will & Grace in 2000 had him playing an "ex-gay" who eventually backslides.