aft, after, aftermost, atavistic, back, backslide, backward, cock, coming apart, cracking, crumbling, decadent, decline, declining, degenerate, descend, deteriorate, deteriorating, disimprove, disintegrate, disintegrating, draining, drooping, dwindling, ebbing, effete, fading, failing, fall astern, fall back, fall behind, falling, flagging, fragmenting, get behind, get worse, go backwards, go behind, going to pieces, grow worse, hind, hinder, hindermost, hindhand, hindmost, invert, jerk back, languishing, lapse, lapse back, let down, lose ground, marcescent, pining, posterior, postern, pull back, reactionary, rear, rearmost, rearward, recede, recessive, recidivate, recidivist, recidivous, regress, regressive, relapse, retract, retral, retreat, retroactive, retrocede, retrocessive, retroflex, retrogress, retrogressive, retrorse, retroverse, retrovert, return, returnable, reverse, reversible, reversional, reversionary, revert, revertible, revulsionary, rot, shriveling, sicken, sink, sinking, slacken, sliding, slip back, slipping, slumping, subsiding, tabetic, tail, waning, wasting, wilting, withering, worsen, worsening