Synonyms and related words :
adverse, antagonistic, bad, baleful, baneful, conflicting, contrary, corroding, corrosive, corrupting, corruptive, counter, counteractive, counterproductive, damaging, deadly, deleterious, destructive, difficult, disadvantageous, disserviceable, distressing, evil, hard, harmful, hostile, hurtful, ill, in opposition, inimical, injurious, lethal, malefic, malevolent, malign, malignant, mischievous, miserable, negative, noisome, not easy, noxious, ominous, opposed, opposing, opposite, pernicious, poisonous, prejudicial, rigorous, scatheful, sinister, stressful, toxic, troublesome, troublous, trying, unadvantageous, unfavorable, unprofitable, unrewarding, untoward, useless, venenate, veneniferous, venenous, venomous, vicious, virulent, worthless, wretched