na-adjective
excellent; outstanding; superb
A straightforward loanword used as a na-adjective to describe something of very high quality. Common in casual and semi-formal contexts, often in advertising or enthusiastic speech.
このレストランのサービスはエクセレントだ。
The service at this restaurant is excellent.
彼のプレゼンは本当にエクセレントだった。
His presentation was truly outstanding.