unthankful
adjectiveUK /ʌnˈθæŋkfəl/
US /ʌnˈθæŋkfəl/
Not saying thank you when someone does something nice for you.
The unthankful boy forgot to thank his grandma for the gift.
OTHER MEANINGS
2. Showing no thanks or gratitude for a kind act.
She felt hurt by his unthankful reply to her help.
3. Not expressing appreciation for something received.
An unthankful guest never said a word about the meal.
4. Lacking a thankful feeling or attitude.
His unthankful attitude made everyone sad.