Unlucky days are those that we always wish to avoid. There are many other words and phrases that we can use to depict an unlucky day. One of them is a jinxed day, which implies that everything goes wrong on that day. Another term is a cursed day, which signifies that there is an unseen power against the day. We can also use the term ill-fated day, which suggests that something tragic happens on that day. A day of misfortune is another synonym for an unlucky day, which indicates that the day brings sadness and unpleasantness. A black day or an unfortunate day are other expressions that we can use to depict an unlucky day.