她看到恶作剧成功后，脸上露出了顽皮而欣喜的笑容。

She had a ___gleeful smile after seeing her prank succeed.

看到对手摔倒在泥地里，他露出幸灾乐祸的笑容。

He wore a ___gleeful smile when he saw his opponent fall into the muddy ground.