Answer:

ingrate

AnswerCrossword Clue
INGRATEThankless sort
INGRATEGift-horse critic
INGRATEThankless one
INGRATEThankless so-and-so
INGRATEUnappreciative sort
INGRATEApplicable to Charles Grandet.
INGRATEUnappreciative person.
INGRATEThankless one.
INGRATEUnthankful one.
INGRATEUnappreciative one
INGRATESore winner
INGRATEThankless wretch
INGRATEBad houseguest
INGRATEUnjustified complainer
INGRATEHe doesn't appreciate Tangier
INGRATEThankless type
INGRATEThankless fellow
INGRATEOne offering no thanks to you