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Virulent

/ˈvɪɹjʊlənt/

(of a disease or disease-causing agent) Highly infectious, malignant or deadly.

📖 Definitions of "Virulent"

adjective

1
(of a disease or disease-causing agent) Highly infectious, malignant or deadly.
2
Hostile to the point of being venomous; intensely acrimonious.
"The politicians were virulent in their hatred of the president."

15 synonyms found via WordNet and Google Books.

Word	Definition
acerbic	(figurative) Sharp, harsh, biting.
causticnoun	Capable of burning, corroding or destroying organic tissue.
acrid	Sharp and harsh, or bitter and not to the taste.
vitriolic	(figuratively) Bitterly scathing, caustic.
venomous	Of an animal (specifically a snake) or parts of its body: producing venom (“a toxin intended for defensive or offensive use”) which is usually injected into an enemy or prey by biting or stinging; hence, of a bite or sting: injecting venom.
unpleasant	Not pleasant.
acerb	(archaic, figurative) Sharp and harsh in expressing oneself.
bitternoun	Having an acrid taste (usually from a basic substance).
sulfurous	(American spelling) Containing sulfur.
toxic	(figurative) Severely negative or harmful.
blisteringnoun	Very hot.
sulphurous	(chiefly British spelling) Alternative spelling of sulfurous. [(American spelling) Containing sulfur.]
deadly	Causing death; lethal.
acidnoun	(chemistry) Any compound which yields H+ ions (protons) when dissolved in water; an Arrhenius acid.
highly infective	(of a microorganism) extremely infective

Words with the opposite meaning.

Word	Definition
avirulent	Not virulent.

Found via reverse dictionary — words that share a conceptual meaning.

Word	Definition
venomous	Of an animal (specifically a snake) or parts of its body: producing venom (“a toxin intended for defensive or offensive use”) which is usually injected into an enemy or prey by biting or stinging; hence, of a bite or sting: injecting venom.
toxic	(figurative) Severely negative or harmful.
blistering	Very hot.
caustic	Capable of burning, corroding or destroying organic tissue.
sulfurous	(American spelling) Containing sulfur.
sulphurous	(chiefly British spelling) Alternative spelling of sulfurous. [(American spelling) Containing sulfur.]
vitriolic	(figuratively) Bitterly scathing, caustic.
acid	Of or pertaining to an acid; acidic.
acerb	(archaic, figurative) Sharp and harsh in expressing oneself.
bitter	Having an acrid taste (usually from a basic substance).
acerbic	(figurative) Sharp, harsh, biting.
acrid	Sharp and harsh, or bitter and not to the taste.
deadly	Causing death; lethal.
unpleasant	Not pleasant.
highly infective	(of a microorganism) extremely infective
virulencenoun	The state of being virulent.
contagious	(of a disease) Easily transmitted to others.
pathogenic	(pathology) Able to cause (harmful) disease.
infectious	(pathology, typically of a person) Able to infect others; capable of transmitting pathogens.
inflammatory	Relating to, causing, or caused by inflammation.