Synonyms and related words :
baleful, baneful, corroding, corrosive, corrupting, corruptive, counterproductive, damaging, deadly, destroying, destructive, detrimental, disadvantageous, disserviceable, distressing, harmful, hurtful, injurious, lethal, malefic, malevolent, malign, malignant, mischievous, noisome, noxious, ominous, pernicious, poisonous, prejudicial, ruining, ruinous, scatheful, toxic, unadvantageous, unfavorable, unprofitable, unrewarding, useless, venenate, veneniferous, venenous, venomous, vicious, virulent, worthless