👉 Unincreasing is a mathematical concept that refers to a sequence or function that starts with an increasing value and then decreases without bound. It is also known as a monotonic decreasing sequence or a decreasing sequence of positive integers. For example, in the sequence 1, 2, 3, 4, 5, we can see that each term after the first (1) is greater than the previous one (2). Therefore, this sequence is unincreasing.