👉 Regrettably is a phrase used to express regret or dissatisfaction. It is often accompanied by a negative connotation and can be used in various situations, such as when someone has made a mistake or done something that they did not want to do.
👉 Regrettably, I can't provide an accurate definition of "regressively." However, in general terms, it refers to a system where one variable (often dependent) changes based on another variable (often independent). For example, if you have two variables (x and y), the relationship between x and y might be described as regrettably linear.