How often do you use “very?”

I find myself using the word very lately, as in something is┬ávery important or very stupid. (I also use really in a similar fashion, and actually, but I’m going to stick with very today.) If something’s important (or stupid), how does does very make it more so? Aren’t the words important and stupid explicit enough on their own without having to define degrees of importance and stupidity? Grammatically speaking, how correct is it to modify an adjective with another adjective? Why do we use adjectives anyway? Sure, the red car distinguishes it from the blue and green ones but why