Definition of unconventional adjective from the Oxford Advanced Learner's Dictionary

  

unconventional

 adjective
adjective
BrE BrE//ˌʌnkənˈvenʃənl//
 
; NAmE NAmE//ˌʌnkənˈvenʃənl//
 
(often approving)
 
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not following what is done or considered normal or acceptable by most people; different and interesting synonym unorthodox an unconventional approach to the problem unconventional views The magazine describes him as having unconventional good looks. opposite conventionalExtra examples In those days, travelling alone was a daring and unconventional thing for a young woman to do. She’s known for her unconventional approach to child-rearing. The magazine described him as having ‘unconventional good looks’. They used a variety of unconventional methods to advertise themselves.
See the Oxford Advanced American Dictionary entry: unconventional