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Untraditional (adjective)
Not traditional, or departing from tradition
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Nontraditional (adjective)
Not traditional; not related to tradition.
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Nontraditional (adjective)
Innovative; new; daring.
Wiktionary
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Untraditional (adjective)
not existing in or as part of a tradition; not customary or long-established
“a distinctly untraditional, ten-storey building”
Oxford Dictionary