All mortiferous synonyms

adj mortiferous

• pernicious — causing insidious harm or ruin; ruinous; injurious; hurtful: pernicious teachings; a pernicious lie.
• noxious — harmful or injurious to health or physical well-being: noxious fumes.
• dangerous — If something is dangerous, it is able or likely to hurt or harm you.
• poisonous — full of or containing poison: poisonous air; a poisonous substance.
• mortal — subject to death; having a transitory life: all mortal creatures.
• cruel — Someone who is cruel deliberately causes pain or distress to people or animals.
• bloody — Bloody is used by some people to emphasize what they are saying, especially when they are angry.
• harmful — causing or capable of causing harm; injurious: a harmful idea; a harmful habit.
• toxic — of, pertaining to, affected with, or caused by a toxin or poison: a toxic condition.
• violent — acting with or characterized by uncontrolled, strong, rough force: a violent earthquake.
• malignant — disposed to cause harm, suffering, or distress deliberately; feeling or showing ill will or hatred.
• virulent — actively poisonous; intensely noxious: a virulent insect bite.
• lethal — of, relating to, or causing death; deadly; fatal: a lethal weapon; a lethal dose.
• fatal — causing or capable of causing death; mortal; deadly: a fatal accident; a fatal dose of poison.
• carcinogenic — A substance that is carcinogenic is likely to cause cancer.
• catastrophic — Something that is catastrophic involves or causes a sudden terrible disaster.
• calamitous — If you describe an event or situation as calamitous, you mean it is very unfortunate or serious.
• cataclysmic — A cataclysmic event is one that changes a situation or society very greatly, especially in an unpleasant way.
• disastrous — causing great distress or injury; ruinous; very unfortunate; calamitous: The rain and cold proved disastrous to his health.
• fateful — having momentous significance or consequences; decisively important; portentous: a fateful meeting between the leaders of the two countries.
• ruinous — bringing or tending to bring ruin; destructive; disastrous: a ruinous war.
• incurable — not curable; that cannot be cured, remedied, or corrected: an incurable disease.
• inevitable — unable to be avoided, evaded, or escaped; certain; necessary: an inevitable conclusion.
• devastating — If you describe something as devastating, you are emphasizing that it is very harmful or damaging.
• grievous — causing grief or great sorrow: grievous news.
• dire — causing or involving great fear or suffering; dreadful; terrible: a dire calamity.
• savage — fierce, ferocious, or cruel; untamed: savage beasts.
• destructive — Something that is destructive causes or is capable of causing great damage, harm, or injury.
• suicidal — pertaining to, involving, or suggesting suicide.
• murderous — of the nature of or involving murder: a murderous deed.
• great — unusually or comparatively large in size or dimensions: A great fire destroyed nearly half the city.
• last — occurring, coming, or being after the usual or proper time: late frosts; a late spring.
• bitter — In a bitter argument or conflict, people argue very angrily or fight very fiercely.
• grave — the grave accent.
• baleful — Baleful means harmful, or expressing harmful intentions.
• baneful — destructive, poisonous, or fatal
• bloodthirsty — Bloodthirsty people are eager to use violence or display a strong interest in violent things. You can also use bloodthirsty to refer to very violent situations.
• cannibalistic — Cannibalistic people and practices are connected with cannibalism.
• deathly — If you say that someone is deathly pale or deathly still, you are emphasizing that they are very pale or still, like a dead person.
• deleterious — Something that has a deleterious effect on something has a harmful effect on it.
• grim — stern and admitting of no appeasement or compromise: grim determination; grim necessity.
• homicidal — of or relating to homicide.
• injurious — harmful, hurtful, or detrimental, as in effect: injurious eating habits.
• internecine — of or relating to conflict or struggle within a group: an internecine feud among proxy holders.
• killing — the act of killing, especially game: The hounds moved in for the kill.
• pestiferous — bringing or bearing disease.
• pestilent — producing or tending to produce infectious or contagious, often epidemic, disease; pestilential.
• ruthless — without pity or compassion; cruel; merciless: a ruthless tyrant.
• unrelenting — not relenting; not yielding or swerving in determination or resolution, as of or from opinions, convictions, ambitions, ideals, etc.; inflexible: an unrelenting opponent of the Equal Rights Amendment.
• venomous — (of an animal) having a gland or glands for secreting venom; able to inflict a poisoned bite, sting, or wound: a venomous snake.