relaxed  
adjective uk/rɪˈlækst/ us/rɪˈlækst/
  (NOT WORRIED)         
 B1 放松的;轻松自在的;从容的
feeling happy and comfortable because nothing is worrying you
  She seemed relaxed and in control of the situation. 她看上去轻松自如,牢牢地把握着局势。 
  无忧无虑的;处之泰然的
If someone is relaxed about something, they are not worried about it.
  My parents are fairly relaxed about me staying out late. 我在外面呆得很晚我父母也不会感到太紧张。 
 - More examples
- There is a very relaxed atmosphere between staff and pupils at the school.
- He climbed onto his horse and set off at a relaxed trot down the lane.
- At the press conference, he sounded at his most relaxed.
- Suntanned and relaxed, looking calmly about the room, he appeared completely in command.
- You should take it as a compliment when I fall asleep in your company - it means I'm relaxed.
  (INFORMAL)      
B2 舒适的;随便的;无拘无束的
A relaxed situation or place is comfortable and informal.
  It's a very friendly bar with a nice relaxed atmosphere. 这间酒吧待客热情,有种随意自在的氛围。