In-grates are people who do not show gratitude to those who have done something for them. There are a variety of synonyms that can be used to describe these people. One such word is ungrateful, which means showing no gratitude. Another synonym is thankless, which describes someone who doesn't acknowledge or appreciate the efforts of others. Other words that can be used include unappreciative, unmindful, and graceless. These words are all similar in meaning and can be used to describe those who do not show gratitude to others. It is important to use these synonyms cautiously, but they can be a helpful way to describe people who are not appreciative.