My suggestion: Don't use adjectives in a Resume. It doesn't matter much because if I am looking for say a programmer who can code in JS, you saying "expert" vs

My suggestion: Don't use adjectives in a Resume. It doesn't matter much because if I am looking for say a programmer who can code in JS, you saying "expert" vs "comfortable" won't change the fact that I will interview you anyway if I decided to otherwise. Yes, when the interview starts, you can clarify your level of experience further. In other words, when I interview Entry Level candidates, I don't give the adjectives much weight. People put all kinds of adjectives on their Resume and I don't pay attention to those. You want to be more specific if possible. You can say "I worked on this project where I was responsible for <xyz>". Then explain it in the interview if asked.