“Proficient” means “skilled” or “practiced.” While it’s a positive word, it’s not the most positive – that is, “proficient” doesn’t necessarily mean “expert.” Being proficient in something means that you’re able to do it well enough to be successful, but there might be many other people who can do it better than you can.

Example:  “She was an excellent legal assistant, as proficient at transcription as she was at preparing documents for court and interviewing clients.”