The word "unthanking" refers to someone who shows no appreciation or gratitude towards something or someone. Some synonyms for this word include ungrateful, thankless, unappreciative, uncaring, and inconsiderate. These words can be used to describe individuals who have a sense of entitlement and take things for granted without acknowledging the efforts of others. It's important to note that being unthankful can affect relationships and may lead to negative consequences. We should always strive to demonstrate gratitude and thankfulness towards others, whether it's for their help, support, or simply for being in our lives.