Synonyms for Harmful:

• adj.

  •bad (adjective)
  • lousy.
  •baneful (adjective)
  • malefic.
  •damaging (adjective)
  • nocent.
  •dangerous (adjective)
  • pestilent,
  • Nocuous.
  •destructive (adjective)
  • calamitous,
  • catastrophic,
  • consumptive,
  • deadly,
  • destructive,
  • devastating,
  • disastrous,
  • damaging,
  • deleterious,
  • detrimental,
  • injurious,
  • Extirpative.
  •evil (adjective)
  • black,
  • sinister,
  • maleficent.
  •harmful (adjective)
  • baleful,
  • damaging,
  • deleterious,
  • detrimental,
  • injurious,
  • malignant,
  • unhealthy,
  • unwholesome.
  •injurious, hurtful (adjective)
  • adverse,
  • bad,
  • baleful,
  • baneful,
  • calamitous,
  • cataclysmic,
  • catastrophic,
  • consumptive,
  • corroding,
  • corrupting,
  • crippling,
  • damaging,
  • deleterious,
  • destructive,
  • detrimental,
  • dire,
  • disadvantageous,
  • disastrous,
  • evil,
  • incendiary,
  • inimical,
  • internecine,
  • malefic,
  • malicious,
  • malignant,
  • menacing,
  • mischievous,
  • murderous,
  • noxious,
  • painful,
  • pernicious,
  • pestiferous,
  • pestilential,
  • risky,
  • ruinous,
  • sinful,
  • sinister,
  • subversive,
  • toxic,
  • unhealthy,
  • unsafe,
  • unwholesome,
  • virulent,
  • Harassing,
  • Nocuous,
  • undermining.
  •noisome (adjective)
  • mephitic,
  • Insalutary.
  •pernicious (adjective)
  • miasmic.
  •ruinous (adjective)
  • ruinous,
  • tumbledown.
  •unhealthy (adjective)
  • unwholesome.
  •wicked (adjective)
  • wicked.

• n.

  •
  • hazardous,
  • perilous,
  • risky.
  •
  • help.
  •harmful (noun)
  • abusive,
  • adverse,
  • bad,
  • baneful,
  • bruising,
  • calumniatory,
  • calumnious,
  • catastrophic,
  • corrupting,
  • counterproductive,
  • damaging,
  • dangerous,
  • deadly,
  • defamatory,
  • degrading,
  • deleterious,
  • denigrating,
  • denigrative,
  • denigratory,
  • detrimental,
  • disadvantageous,
  • evil,
  • hurtful,
  • ill,
  • inauspicious,
  • injurious,
  • insidious,
  • libellous,
  • libelous,
  • malign,
  • minus,
  • mischievous,
  • negative,
  • nocent,
  • pernicious,
  • pestilent,
  • prejudicial,
  • prejudicious,
  • ruinous,
  • slanderous,
  • stabbing,
  • subtle,
  • traumatic,
  • unfavorable,
  • unfavourable,
  • unsafe,
  • untoward,
  • vesicant,
  • vesicatory,
  • wounding.
  •injurious (noun)
  • aching,
  • annihilative,
  • brutal,
  • cataclysmic,
  • consumptive,
  • corroding,
  • corrosive,
  • corrupt,
  • costly,
  • crippling,
  • cruel,
  • demoniac,
  • devilish,
  • devouring,
  • diabolic,
  • dire,
  • distressing,
  • fatal,
  • fell,
  • felonious,
  • grievous,
  • habit-forming,
  • ill-omened,
  • incendiary,
  • inimical,
  • internecine,
  • lethal,
  • malefic,
  • maleficent,
  • malevolent,
  • malicious,
  • malignant,
  • menacing,
  • mephitic,
  • morbific,
  • mortal,
  • murderous,
  • objectionable,
  • ominous,
  • painful,
  • pricking,
  • satanic,
  • serious,
  • sinful,
  • sinister,
  • sore,
  • stunting,
  • subversive,
  • toxic,
  • treacherous,
  • unfortunate,
  • unlucky,
  • unpropitious,
  • venomous,
  • vicious,
  • virulent,
  • wicked,
  • wild,
  • Afflicting,
  • Extirpative,
  • Fiendish,
  • Harassing,
  • Nocuous,
  • Sapping,
  • Sinistrous,
  • demolitionary,
  • undetermining.

• Other synonyms:

  •
  • cataclysmic,
  • dangerously,
  • hazardous,
  • inimical,
  • kamikaze,
  • marauding,
  • perilous,
  • precarious,
  • threatening,
  • treacherous.
  •
  • convulsive,
  • ferocious,
  • glowering,
  • hostile,
  • nasty.
  •
  • fatal,
  • mortal,
  • serious,
  • suspect,
  • terrible.
  •
  • hot.
  •absorbing
  • consuming.
  •deadly
  • lethal.
  •delicate
  • touchy.
  •high-priced
  • costly.
  •injurious
  • invidious.
  •malignant
  • cancerous.
  •noxious
  • noxious,
  • Nocuous.
  •self-destructive
  • suicidal.
  •vicious
  • cruel.
  •Other relevant words:
  • abusive,
  • aching,
  • acid,
  • acrid,
  • acrimonious,
  • acute,
  • adverse,
  • agonizing,
  • annihilative,
  • antagonistic,
  • awful,
  • bad,
  • badly,
  • baneful,
  • base,
  • biting,
  • black,
  • bruising,
  • brutal,
  • burning,
  • calumniatory,
  • calumnious,
  • cancerous,
  • cataclysmic,
  • conflicting,
  • consuming,
  • consumptive,
  • contaminated,
  • contrary,
  • convulsive,
  • corroding,
  • corrosive,
  • corrupt,
  • corrupting,
  • corruptive,
  • costly,
  • counter,
  • counteractive,
  • counterproductive,
  • crippling,
  • cruel,
  • cussed,
  • cutting,
  • dangerous,
  • dangerously,
  • debased,
  • defamatory,
  • degrading,
  • demoniac,
  • denigrating,
  • denigrative,
  • denigratory,
  • depraved,
  • devilish,
  • devouring,
  • diabolic,
  • difficult,
  • dire,
  • disadvantageous,
  • disapproving,
  • distressing,
  • disturbing,
  • dreadful,
  • evil,
  • exploitative,
  • exploitatory,
  • exploitive,
  • fatal,
  • fateful,
  • fell,
  • felonious,
  • ferocious,
  • fierce,
  • foul,
  • furtive,
  • glowering,
  • grave,
  • grievous,
  • habit-forming,
  • hard,
  • harsh,
  • hateful,
  • hazardous,
  • heavy,
  • help,
  • hostile,
  • hot,
  • hurtful,
  • iii,
  • ill,
  • ill-omened,
  • improper,
  • in opposition,
  • inauspicious,
  • incendiary,
  • incisive,
  • incorrect,
  • indecent,
  • indecorous,
  • inexpedient,
  • inimical,
  • iniquitous,
  • inopportune,
  • insalubrious,
  • insanitary,
  • insidious,
  • internecine,
  • invidious,
  • kamikaze,
  • keen,
  • lethal,
  • libellous,
  • libelous,
  • lousy,
  • malefic,
  • maleficent,
  • malevolent,
  • malicious,
  • malign,
  • malignant,
  • marauding,
  • mean,
  • menacing,
  • mephitic,
  • miasmic,
  • minus,
  • mischief-making,
  • mischievous,
  • miserable,
  • morbific,
  • mordant,
  • mortal,
  • murderous,
  • nasty,
  • nefarious,
  • negative,
  • nocent,
  • noisome,
  • noxious,
  • objectionable,
  • offensive,
  • ominous,
  • opposed,
  • opposing,
  • opposite,
  • ornery,
  • painful,
  • pathogenic,
  • peccant,
  • perilous,
  • pernicious,
  • perverted,
  • pessimistic,
  • pestiferous,
  • pestilent,
  • pestilential,
  • poisonous,
  • polluted,
  • precarious,
  • prejudicial,
  • prejudicious,
  • pricking,
  • rigorous,
  • risky,
  • rotten,
  • ruinous,
  • satanic,
  • savage,
  • scathing,
  • scorching,
  • septic,
  • serious,
  • severe,
  • sharp,
  • shocking,
  • sinful,
  • sinister,
  • slanderous,
  • sneaky,
  • sore,
  • spiteful,
  • stabbing,
  • stern,
  • stressful,
  • stunting,
  • subtle,
  • subversive,
  • suicidal,
  • suspect,
  • tainted,
  • terrible,
  • threatening,
  • touchy,
  • toxic,
  • traumatic,
  • treacherous,
  • troublesome,
  • troublous,
  • trying,
  • unbecoming,
  • uncomely,
  • unconstructive,
  • underhand,
  • unfavorable,
  • unfavourable,
  • unfortunate,
  • unhealthful,
  • unhelpful,
  • unhygienic,
  • unlucky,
  • unprofitable,
  • unpropitious,
  • unrewarding,
  • unsafe,
  • unsanitary,
  • unseemly,
  • untoward,
  • upsetting,
  • useless,
  • venomous,
  • vesicant,
  • vesicatory,
  • vicious,
  • vile,
  • villainous,
  • violent,
  • virulent,
  • vitiated,
  • vitriolic,
  • wicked,
  • wild,
  • withering,
  • worthless,
  • wounding,
  • wretched,
  • wrong,
  • Afflicting,
  • Disserviceable,
  • Extirpative,
  • Fiendish,
  • Harassing,
  • Insalutary,
  • Misapplied,
  • Nocuous,
  • Perverting,
  • Sapping,
  • Scathful,
  • Searing,
  • Sinistrous,
  • Venenate,
  • life-threatening,
  • undermining,
  • traumatizing,
  • tumbledown,
  • unadvantageous,
  • unsalutary,
  • veneniferous,
  • venenous,
  • Scatheful,
  • killing,
  • bitchy,
  • demolitionary,
  • undetermining,
  • bad for,
  • counter-productive,
  • not easy.

Antonyms for Harmful:

• adj.

  • all
    harmless.
  • injurious, hurtful
    advantageous, beneficial, favorable, fortunate, good, harmless, healthy, helpful, honest, kind, lucky, profitable, safe, upright, Aiding, Assisting.
  • Other antonyms:
    advantageous, anodyne, beneficent, beneficial, benign, benignant, curative, favorable, good, harmless, healthful, healthy, helpful, innocent, innocuous, inoffensive, invigorating, life-giving, nonfatal, noninfectious, nonlethal, nonpoisonous, nontoxic, nonvenomous, palliative, profitable, propitious, remedial, safe, salubrious, salutary, secure, serviceable, sound, useful, wholesome, Hurtless, rejuvenating, noncorrosive, nonpolluting, nondestructive.

• Other antonyms:

  • n. t.
    advantageous, anodyne, atoxic, beneficial, benign, benignant, favorable, favourable, flattering, fortunate, good, harmless, healthful, healthy, helpful, honest, innocent, innocuous, inoffensive, nonfatal, noninfectious, nonlethal, nonpoisonous, nontoxic, nonvenomous, painless, palliative, profitable, propitious, safe, salubrious, salutary, secure, sound, upright, useful, wholesome, Aiding, Assisting, Hurtless, noncorrosive, nonpolluting, nondestructive.