Synonyms and related words :
adverse, antagonistic, bad, bad for, baleful, baneful, bitchy, conflicting, contaminated, contrary, corroding, corrosive, corrupting, corruptive, counter, counteractive, counterproductive, cussed, damaging, dangerous, deadly, deleterious, destructive, detrimental, difficult, disadvantageous, disserviceable, distressing, evil, foul, hard, hateful, hazardous, hostile, hurtful, ill, in opposition, inimical, iniquitous, injurious, insalubrious, insanitary, invidious, lethal, malefic, maleficent, malevolent, malicious, malign, malignant, mean, mischievous, miserable, morbific, nasty, noisome, not easy, noxious, ominous, opposed, opposing, opposite, ornery, pathogenic, peccant, pernicious, pestiferous, poisonous, polluted, prejudicial, rigorous, risky, scatheful, septic, sinister, stressful, tainted, toxic, troublesome, troublous, trying, unadvantageous, unfavorable, unhealthful, unhealthy, unhygienic, unprofitable, unrewarding, unsafe, unsanitary, untoward, unwholesome, useless, venenate, veneniferous, venenous, venomous, vicious, virulent, wicked, worthless, wretched