Synonyms of the word

deadly

• adj. (obsolete) Subject to death; mortal.
• adj. Causing death; lethal.
• adj. Aiming or willing to destroy; implacable; desperately hostile.
• adj. (by extension) Very accurate (of aiming with a bow, firearm, etc.).
• adj. (informal) Very boring.
• adj. (informal) Excellent, awesome, cool.
• adv. (obsolete) Fatally, mortally.
• adv. In a way which suggests death.
• adv. Extremely.

baneful

• adj. Exceedingly harmful; causing harm, death, ruin.
• adj. Deadly or sinister.
• adj. Portending disaster.
• adj. (archaic) Poisonous.

deathly

• adj. Appearing as though dead, or on the verge of death.
• adj. Fatal, causing death.
• adj. Extreme.
• adv. In a way that resembles death.
• adv. Extremely, dreadfully.

deucedly

• adv. (degree, informal) Quite; extremely.

devilishly

• adv. In a devilish manner.

fatal

• adj. Proceeding from, or appointed by, fate or destiny.
• adj. Foreboding death or great disaster.
• adj. Causing death or destruction.
• adj. (computing) Causing a sudden end to the running of a program.
• n. A fatality; an event that leads to death.
• n. (computing) A fatal error; a failure that causes a program to terminate.

harmful

• adj. of a kind likely to be damaging; injurious.

insanely

• adv. In an insane manner.
• adv. To a great degree; very much.

lethal

• adj. Deadly; mortal; fatal.
• n. (chemistry) One of the higher alcohols of the paraffine series obtained from spermaceti as a white crystalline…

lifelessly

• adv. Without life or appearing to be without life.

madly

• adv. In a mad manner; without reason or understanding; wildly.

mortal

• adj. Susceptible to death by aging, sickness, injury, or wound; not immortal.
• adj. Causing death; deadly, fatal, killing, lethal (now only of wounds, injuries etc.).
• adj. Fatally vulnerable; vital.
• adj. Of or relating to the time of death.
• adj. Affecting as if with power to kill; deathly.
• adj. Human; belonging to man, who is mortal.
• adj. Very painful or tedious; wearisome.
• adj. (Britain, slang) Very drunk; wasted; smashed.
• n. A human; someone susceptible to death.

noxious

• adj. Harmful; injurious.

pernicious

• adj. Causing much harm in a subtle way.
• adj. Causing death or injury; deadly.

pestilent

• adj. Highly injurious or destructive to life: deadly.
• adj. (informal) Annoying.
• adj. (archaic) Harmful to morals or public order.

toxic

• adj. (toxicology) Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering…
• adj. (figuratively) negative, harmful.

unpardonable

• adj. impossible to pardon; impossible to excuse or justify.

venomous

• adj. Full of venom.
• adj. Toxic; poisonous.
• adj. Noxious; evil.
• adj. Malignant; spiteful; hateful.
• adj. Producing venom (poison usually injected into an enemy or prey by biting or stinging) in glands or accumulating…
• adj. powerful.

virulent

• adj. (chiefly medicine, of a disease or disease-causing agent) Highly infectious, malignant, or deadly.
• adj. Hostile to the point of being venomous; intensely acrimonious.