adverse

1 opposed to one's interests all the adverse publicity really caused the movie star's popularity to suffer Synonyms counter, disadvantageous, hostile, inimical, negative, prejudicial, unfavorable, unfriendly, unsympathetic, untoward Related Words bad, baleful, baneful, evil; damaging, deleterious, destructive, detrimental, fatal, harmful, hurtful, ill, injurious, lethal, malignant, murderous, noxious, pernicious, poisonous, ruinous, threatening, troublesome, unhealthy, wounding; dangerous, hazardous, imperiling (or imperilling), jeopardizing, parlous, perilous, risky, unsafe; calumnious, defamatory, detractive, offensive, scathing, slanderous; antagonistic, antipathetic, inhospitable, intolerant, uncongenial, uncooperative; competing, conflicting, counteracting, countering, opposing, resistant, resisting Near Antonyms beneficial, good, helpful, propitious, useful; harmless, innocent, innocuous, inoffensive, nondestructive, nonfatal, nonlethal, nonthreatening; unresistant; tolerant, understanding; affable, agreeable, amiable, amicable, benign, benignant, complying, congenial, cordial, friendly, hospitable Antonyms advantageous, favorable, friendly, positive, supportive, sympathetic, well-disposed

2 causing or capable of causing harm the adverse effects of the drug are too severe to allow it to be marketed Synonyms harmful, bad, baleful, baneful, damaging, dangerous, deleterious, detrimental, evil, hurtful, ill, injurious, mischievous, nocuous, noxious, pernicious, prejudicial, wickedRelated Words hostile, inimical, unfriendly; contagious, deadly, infectious, infective, pestiferous, pestilent, pestilential, poisonous, venomous; insidious, menacing, ominous, sinister, threatening; hazardous, imperiling (or imperilling), jeopardizing, parlous, perilous, risky, unsafe, unsound; nasty, noisome, unhealthful, unhealthy, unwholesome; destructive, fatal, killer, lethal, malignant, ruinousNear Antonyms advantageous, beneficial, useful; favorable, good, propitious; curative, healthful, healthy, helpful, palliative, remedial, salubrious, salutary, wholesome; secure, sound; benignant; noncorrosive, nondestructive, nonfatal, noninfectious, nonlethal, nonpoisonous, nonpolluting, nontoxic, nonvenomousAntonyms anodyne, benign, harmless, hurtless, innocent, innocuous, inoffensive, safe