Definition of unconventional adjective from the oxford advanced learner's dictionary. Different from what is usual or from the way most people do things: Unorthodox, original, unusual, irregular, atypical, different, uncustomary the vaccine had been produced by an unconventional technique.
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Not following what is done or considered normal or acceptable. If you describe a person or their attitude or behaviour as unconventional, you mean that they do not behave in the same way as most other people in. Being out of the ordinary.
The meaning of unconventional is not conventional :
Not bound by or in accordance with convention :