destruction deterioration weakening worsening degradation degeneration decline retrogression breakdown atrophy enfeeblement debilitation relapse waning slump fall collapse drop downturn disintegration lapse slide slip declination disrepair putrefaction withering decay downgrade depreciation corrosion lessening aggravation decomposition dip downfall abasement diminution decadence downtick decaying degeneracy debasement sinking depression vitiation loss penalty damage harm hurt injury sickness illness ailment disease indisposition infection fever virus