"Untraditional" refers to something that does not follow the usual or expected way of doing things. It describes something that is different, new, or unconventional. Full definition
Many of Perreault's abstract paintings revel in the use of untraditional media such as toothpaste, oil - polluted sand, and coffee — which the Village Voice praised as «exquisite sepia revelations.» (hamptonsarthub.com)
His defiantly untraditional approach to politics delights his supporters and exasperates his detractors. (theguardian.com)
I am always looking for untraditional ways to display the traditions of each season... these are great! (theletteredcottage.net)