unconventional

/ˌʌnkənˈvɛnʃənəl/
adjective
  1. Not following what is generally done or believed; different from the usual way.
    • She has an unconventional approach to teaching that keeps students engaged.
    • The artist is known for her unconventional use of recycled materials.
    • His unconventional hairstyle made him stand out in the crowd.