An antonym for considerate is inconsiderate.
Inconsiderate describes someone who does not think about the feelings or needs of others. They may act selfishly or carelessly, failing to show empathy or regard for how their actions affect those around them. While a considerate person will often take time to consider the impact of their behavior on others and act with thoughtfulness, an inconsiderate person tends to prioritize their own interests without regard for how their choices might affect others. Understanding these contrasting characteristics can help us foster more meaningful relationships by encouraging considerate behavior and minimizing inconsiderate actions.