Synonyms for Backslid:

v.

receded (verb)
Fled, Regressed, retreated, Receded.
regressed (verb)
Declined, Returned, recessed, Relapsed.
relapsed (verb)
Recurred, lapsed.
renounced (verb)
Abdicated, Abnegated, retracted, abandoned, Betrayed, crossed, deserted, Renounced, defected, Denied, Disavowed.