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1. Not conforming to legality, moral law, or social convention
   "an unconventional marriage";
   - improper, unlawful
    
2. Not conforming to accepted rules or standards
   "her unconventional dress and hair style"
    
3. Not conventional or conformist
   "unconventional life styles"

See also: alternative, bizarre, bohemian, convention, conventionalism, conventionality, devil-may-care, eccentric, far-out [informal], flakey [informal], flaky [informal], freakish, freaky [informal], funky [informal], go-as-you-please, gonzo [N. Amer, informal], irregular, kinky [informal], maverick, offbeat [informal], off-the-wall [informal], original, outlandish, outré, quirky [informal], raffish, rakish, spaced-out [informal], spacey [informal], spacy [informal], unorthodox, way-out [informal]

Antonym: conventional

Encyclopedia: Unconventional