nontraditional

/ˌnɑntrəˈdɪʃənəl/
adjective
  1. Not following or conforming to established customs, beliefs, or practices.
    • The school offers nontraditional programs for adult learners who work during the day.
    • They chose a nontraditional wedding ceremony on the beach instead of in a church.
    • Her nontraditional approach to cooking combines ingredients from different cuisines.