Pernicious(Adjective)
Having a very harmful effect on somebody/something, especially in a way that is not easily noticed.
Hindi meaning:घातक
Synonyms: Baneful, Deadly, Harmful, Detrimental
Antonyms: Harmless, Beneficial, Advantageous, Helpful
Example: Ageism is equally as offensive and pernicious as sexism.
Trick to remember: Per nasha sabke liye pernicious hai. 
