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.
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 .