improvement Antonyms

worsening deterioration decline riprap reversion retrusion retroversion retrogression retroflexion retrocession retroaction stele ropiness rot stanchion stagnation socle slippage setback seediness scaffold ruination ruin retreat regression refluence piling pilaster pier pes peristyle peduncle pediment pedicel pedestal pillared plinth poorliness reentry reduction recrudescence recidivation recession recess pylon puncheon props oxidation big step backward landing gear