表示“舒服的舒适的” “温暖的” “顺利的”几个形容词

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comfortable：
making you feel physically relaxed, and not too hard, hot, cold etc. Also used about people feeling physically relaxed:
  The hotel was very comfortable.
  I tried to get into a more comfortable position.


comfy：
informal, comfortable – used especially about furniture and clothes:
  a comfy armchair
  These shoes are very comfy.
  Are you comfy?


cosy/cozy:
cosy, British English, cozy, American English
comfortable and warm – used especially about small rooms, houses etc:
  There’s a cosy lounge with a real fire.
  a cozy apartment


snug:
small, warm, and comfortable, especially in a way that makes you feel protected – used especially about rooms, houses etc. Also used about people feeling warm and comfortable:
  It was very cold outside, but our tents were snug and warm.
  She wished she was back in her snug little house.
  I’m snug as a rug in here! (=very snug – an informal use BrE)


smooth:
a smooth  journey is comfortable because your car or plane does not shake, or the sea is not rough:
Did you have a smooth flight?
a smooth crossing