Wiktionary
unconventionally
adv. In an unconventional manner.
WordNet
unconventionally
adv. in an unconventional manner; "she always behaves rather unconventionally" [ant: conventionally]
Usage examples of "unconventionally".
The tiger, known to the Devereux stables simply as the Imp, since he was even smaller than usual for a tiger, was unconventionally dressed--not in black and yellow stripes, but in red and blue ones.