Laid-back (adjective)

1. Relaxed and easygoing.
2. Not easily stressed or upset.

Origin:

Mid 20th century: from laid (past participle of lay) + back.

Examples:

1. He has a laid-back approach to life.
2. She has a laid-back personality.
3. The laid-back atmosphere of the beach.
4. The laid-back attitude of the staff.
5. The laid-back style of the restaurant.