What is the opposite of unharmful?

Need antonyms for unharmful? Here's a list of opposite words from our thesaurus that you can use instead.

Contexts Causing, or capable of causing, harm Carrying an intent to harm Requiring or involving physical effort Likely to have adverse consequences Adjective ▲ Causing, or capable of causing, harm adverse malicious harmful hurtful pernicious malignant evil spiteful baleful damaging destructive hostile malign malevolent poisonous bitter venomous detrimental vengeful vindictive rancorous nasty vicious injurious deleterious insidious vitriolic bad wounding prejudicial defamatory cruel ill noxious dangerous unkind wicked baneful troublesome mean nocuous perilous maleficent artful catty malefic hazardous bothersome mischievous ill-natured evil-intentioned Adjective ▲ Carrying an intent to harm evil harmful hurtful injurious detrimental deleterious inimical bad mischievous pernicious malignant malign baleful venomous noxious poisonous corrupting subversive baneful calamitous damaging dangerous ill nocuous prejudicial disastrous destructive ruinous malefic maleficent prejudicious deadly fatal lethal disadvantageous unfortunate toxic adverse environmentally unfriendly unfavourableUK wounding unsafe undesirable cancerous crippling negative unfavorableUS dire wicked pestilential pestiferous unhealthy unwholesome hazardous risky catastrophic cataclysmic devastating counterproductive malevolent sinister malicious nocent corroding virulent lethiferous annihilative wreckful internecine wrackful suicidal slaughterous eradicative extirpative noisome mortal death-dealing disturbing dicey threatening parlous precarious perilous painful ruining destroying murderous incendiary undermining harassing corrosive insalubrious menacing sinful critical toxiferous envenomed infective poison poisoned peccant contaminated septic toxicant corrupt viperous mephitic cataclysmal violent annihilatory fierce fateful ravaging devastative savage brutal damning consumptive erosive cutthroat fell “There is an evil undertone in his charming and sociable demeanor.” Adjective ▲ Requiring or involving physical effort energetic strenuous gruelingUS vigorous arduous difficult formidable gruellingUK laborious punishing rigorous taxing demanding exhausting fatiguing hard heavy rugged stiff tiring toilsome tough backbreaking challenging exacting knackering severe toilful operose energy-consuming high-energy “My personal trainer has come up with an energetic exercise routine.” Adjective ▲ Likely to have adverse consequences dangerous risky hazardous perilous unsafe high-risk treacherous threatening unsound chancy reckless fraught with danger parlous tricky precarious uncertain unpredictable insecure vulnerable daredevil dicey death-defying exposed breakneck hairy touch-and-go dodgy gnarly sticky compromisable tottery venturesome alarming dangersome hot playing with fire Russian roulette shaky ugly unchancy unstable daring “We will have to hire a stuntman for this scene because it is too dangerous for you to perform.” Find more words! 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Sentences with the word unharmful Words that rhyme with unharmful Use our Antonym Finder Nearby Words unharmfully unharmonious unharmoniously unharness unharnessed unharnesses unharmed unhappy situation unhappy unhappinesses unhappiness unhappily 9-letter Words Starting With u un unh unha unhar unharm unharmf unharmfu