This is the 2219th most frequent Japanese word.
立派
Excellent; admirable; splendid; remarkable.
In this sentence, 立派 is used to describe the quality of someone's ability or performance as being highly commendable and excellent.
彼の進行役は立派だった。
His role as a moderator was excellent.
Here, 立派 is used to convey a sense of prominence and grandeur in appearance.
あの家は山の中で立派に目立つ。
That house stands out prominently in the mountains.
In this usage, 立派 is used tfi express someone's virtues, integrity, or commendable characteristics.