excellent, admirable, fine
彼はりっぱな英語で自分の考えを述べた。
He expressed his thoughts in excellent English.
りっぱだねえ
That’s impressive.
— 崖の上のポニョ (2008)
宗ちゃんりっぱよー
Sou-chan, you’re amazing!
りっぱだねぇ
That's impressive.