Virulent(adjective)
(of a disease or poison) extremely severe or harmful in its effects.
Hindi meaning:द्वेषपूर्ण
Synonyms: Poisonous, Toxic, Noxious, Deadly, Venomous
Antonyms: Pleasant, Harmless, Innocuous, Nontoxic
Example: The poison is so virulent that it kills a fish instantly.
Trick to remember: Poison virulent hai ye mouse ko mar deta hai 
