The quality of being bitter; resentment or anger resulting from a perceived injustice.

कड़वाहट

English Usage: Her bitterness towards the company stemmed from years of being overlooked for promotions.

Hindi Usage: कंपनी के प्रति उसकी कड़वाहट कई वर्षों तक पदोन्नति से नजरअंदाज किए जाने से उत्पन्न हुई।