There are many synonyms for the word "be neglectful," all of which refer to failing to take proper care or attention. Some common synonyms include being careless, negligent, heedless, inattentive, forgetful, thoughtless, and irresponsible. These words suggest a lack of responsibility and carefulness when it comes to completing tasks or meeting obligations. Neglectful behavior can lead to negative consequences, so it's important to be aware of when you might be slipping into these tendencies. By understanding the implications of neglectful behavior and catching yourself in the act, you can take steps to correct your actions and become more diligent in your responsibilities.