"unconventional" in the adjective sense
1. unconventional
not conforming to accepted rules or standards
"her unconventional dress and hair style"
2. unconventional
not conventional or conformist
"unconventional life styles"
3. improper, unconventional, unlawful
not conforming to legality, moral law, or social convention
"an unconventional marriage"
"improper banking practices"
Source: WordNet® (An amazing lexical database of English)
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