Not feeling or showing gratitude; failing to appreciate kindness.

आभार न मानने वाला

English Usage: He was ungrateful for all the hard work she had put in.

Hindi Usage: उसने जो मेहनत की, उसके लिए वह आभार न मानने वाला था।

The state of being ungrateful or not showing appreciation.

आभारहीनता

English Usage: Her ungratefulness was shocking after all the help he had given her.

Hindi Usage: उसके आभारहीनता से सभी हैरान थे जब उसने उसकी मदद के लिए कुछ भी नहीं कहा।