形容词是sick,意思是生病的,副词是sickly,意思是生病地,例如:

1、All the years he was sick my mother had nursed him.他生病的这些年来,我妈妈一直照料着他。

2、The woman's concern for her sick child is great.那个妇女非常挂念生病的孩子。

3、He was a sickly man.他是一个多病的人。