Irritant(noun)
something that makes you annoyed or causes trouble.
Hindi meaning:क्रोध उत्पन्न करने वाला
Synonyms: source of irritation, source of vexation, thorn in someone's side, pinprick
Antonyms: source of joy, delight
Example: The presence of the army has been a constant irritant.
Trick to remember: Irritate karne vali chiz ko irritant kahte h. 
