unkonventionell
unconventional
Not corresponding to the usual social rules, forms, or habits; in an original, unusual way.
Sie hat eine sehr unkonventionelle Art, Probleme zu lösen.
She has a very unconventional way of solving problems.

unconventional
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unconventional
Not corresponding to the usual social rules, forms, or habits; in an original, unusual way.
Sie hat eine sehr unkonventionelle Art, Probleme zu lösen.
She has a very unconventional way of solving problems.

The word consists of the prefix 'un-' and the adjective 'konventionell' (conventional). The prefix 'un-' expresses negation here and means 'not'. 'Unkonventionell' (unconventional) is therefore the direct opposite of 'konventionell' (conventional).
Seine Kunst war vielen Kritikern zu unkonventionell.
His art was too unconventional for many critics.
'Unkonventionell' (unconventional) often describes creative or personal approaches. Typical combinations are: an unconventional method, an unconventional solution, an unconventional lifestyle, or unconventional ideas.
Mit ihrer unkonventionellen Methode konnte sie das Problem schnell lösen.
With her unconventional method, she was able to solve the problem quickly.
The word 'unkonventionell' (unconventional) belongs more to elevated or educated language. It is often used in discussions about art, science, lifestyles, or innovative ideas.
Der Architekt ist für seine unkonventionellen Entwürfe bekannt.
The architect is known for his unconventional designs.
traditional
'traditionell' and 'unkonventionell' are opposites. 'traditionell' describes something that follows an old habit, a custom, or a familiar form. 'unkonventionell' describes something that does not follow the usual rules or expectations and therefore seems unusual or original. So traditional is more familiar and tried-and-tested, while unconventional is more new, different, or surprising. Both words can be meant positively, depending on whether you want to emphasize what is established or what is unusual.

Ist diese unkonventionelle Idee wirklich für die Feier geeignet?
Is this unconventional idea really suitable for the celebration?
Beim Training beginnt die Gruppe traditionell mit leichten Übungen.
During training, the group traditionally starts with light exercises.