I do a similar thing but just use "proficient" and "familiar", leaves much less room for misinterpretation when there are only two levels imo. Over time I've also trimmed down the list significantly to only languages I would be OK working with and be comfortable doing an interview in. For example, I know C++ to a "familiar" level thanks to school, but I personally dislike it and wouldn't want to it to be part of my work at all, so it's not on my resume.