The quality of being unemotional or detached.

उदासीनता

English Usage: His dispassionateness in the argument surprised everyone, as he usually reacted strongly.

Hindi Usage: उसके तर्क में उदासीनता ने सभी को चौंका दिया, क्योंकि वह आमतौर पर मजबूत प्रतिक्रिया करता है।