There are several synonyms that can be used to convey the meaning of "after the deadline." These include overdue, late, past due, tardy, delayed, and behind schedule. Each of these words expresses a sense of something being completed or turned in after it was due. Whether it's an assignment, a payment, or a project, missing a deadline can have consequences. Using these synonyms can help to avoid sounding repetitive while still clearly communicating the missed deadline. Regardless of the word used, it's important to communicate promptly and effectively with those impacted by your delay.