1. (a.) Passing back; returning.

2. (a.) Characterized by retrogression; retrogressive.

apostate ascending atavistic axial back back-flowing backsliding backward coming apart cracking crumbling decadent declining degenerate descending deteriorating disintegrating down-trending downward draining drifting drooping dwindling ebbing effete fading failing falling flagging flowing fluent flying fragmenting going going to pieces gyrational gyratory languishing lapsing marcescent mounting passing pining plunging progressive reactionary recessive recidivist recidivous recrudescent reflowing refluent relapsing retroactive retrocessive retrograde retrogressive retrorse retroverse returnable reversible reversional reversionary revertible revulsionary rising rotary rotational rotatory running rushing shriveling sideward sinking sliding slipping slumping soaring streaming subsiding tabetic up-trending upward waning wasting wilting withering worsening