unconventional

adjective

1. not conventional; not bound by or conforming to convention, rule, or precedent; free from conventionality: an unconventional artist; an unconventional use of material.

adjective

1. not conforming to accepted rules or standards

adj.1832, from un- (1) “not” + conventional. “A 19 cent. epithet for a certain type of affectation.” [Weekley] Related: Unconventionally.