Synonyms of 'ungrateful'
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If you are heedless of someone or something, you do not take any notice of them.
She scattered the letters about in her heedless haste.
Video: pronunciation of 'ungrateful'
Thesaurus for ungrateful from the Collins English Thesaurus
If you describe someone as ungrateful , you are criticizing them for not showing thanks or for being unkind to someone who has helped them or done them a favour .