Definition of ungrateful adjective from the Oxford Advanced Learner's Dictionary

 

ungrateful

 adjective
adjective
BrE BrE//ʌnˈɡreɪtfl//
 
; NAmE NAmE//ʌnˈɡreɪtfl//
 
 
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not showing or expressing thanks for something that somebody has done for you or given to you opposite gratefulWord Familygrateful adjective (ungrateful)gratefully adverbgratitude noun (ingratitude)
See the Oxford Advanced American Dictionary entry: ungrateful