Synonyms of regression

2 Syllables
lapse, flipflop, toryism, throwback, setback
3 Syllables
relapse, backsliding, reverse, reverting, relapsing, atavism, relapsed, movement
4 Syllables
retroversion, diminishment, decadence, devolution, obscurantism, recidivism, retrogression, diminuendo, counterpole
5 Syllables
retrogradations, retrogradation
6 Syllables
counterrevolution