As adjectives the difference between unconventional and unsystematic
is that unconventional is not adhering to convention or accepted standards while unsystematic is not systematic.
As a noun unconventional
is something or someone that is unconventional.
unconventional
English
Adjective
(
en adjective)
Not adhering to convention or accepted standards
Out of the ordinary
Atypical
Noun
(
en noun)
Something or someone that is unconventional.