comfortable是形容词，只能修饰名词：
It was a pleasant, comfortable farm with gardens of rich colour and large shady green trees and lawns
这是一个让人感到愉快、舒适的农庄，花园色彩缤纷，草坪上绿树成荫。
comfortably 是副词，可以修饰动词，意思是： 舒服地;舒适地;安逸地
参考例句
1. We are now comfortably established in our new house.
我们迁居新屋业已安顿下来。收藏
2. The hotel is elegantly and comfortably appointed.
这旅馆陈设得雅致舒适。收藏
3. The evenings are comfortably cool.
晚上凉快令人舒适。收藏
温馨提示：答案为网友推荐，仅供参考