Definition of ungrateful adjective from the Oxford Advanced American Dictionary

 

ungrateful

 adjective
adjective
NAmE//ʌnˈɡreɪtfl//
 
 
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not showing or expressing thanks for something that someone has done for you or given to you opposite grateful
ungratefully
 
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NAmE//ʌnˈɡreɪtfəli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: ungrateful