You must have forgotten to add salt if the vegetables are so bland, which means medium bland.

You must have forgotten to add salt when vegetables are so bland. Medium bland means light or tasteless.

The basic meaning of "light" is that it contains less salt, which is opposite to "salty", such as light taste and fresh water; its extended meaning is shallow, thin, and contains less certain ingredients, which is opposite to "thick", such as Light wine, light green.

In daily use, "light" is often used as an adjective, indicating thinness, such as light moth and light smoke

Tell me about my personal experience:

I work in a food processing factory and seldom go home. When I do, I will have dinner with my parents. My mother’s cooking skills are relatively average, so she often forgets to add salt or adds less salt when cooking, so the dishes she cooks are relatively bland. Therefore, I often argue with her and let her adjust the taste of the dishes. It got a little worse, but she couldn't change it.

As a child, it is very hard for my mother to cook. I am embarrassed to always nag and tell myself to make do with some food. Anyway, I often want to go home often, but this does not affect my family. In the relationship between us, she will always be my good mother.