Continually and with great effort without achieving the desired result
लगातार बहुत प्रयास करने के बावजूद बिना सफलता प्राप्त किए
English Usage: You can argue till you're blue in the face, but you won't change his mind.
Hindi Usage: तुम जितना चाहो बहस कर लो, लेकिन उसका मन नहीं बदल पाओगे।
nishphal prayas karte rehna, nishfal prayas karte rehna, nishphal prayaas karte rahna, nishfal prayaas karte rahna, nishphal prayas karna chahiye, nishfal prayas karna chahiye, nishphal koshish karte rehna, nishfal koshish karte rahna
