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Adjective: sinful  sin-ful
  1. Characterized by iniquity; wicked because it is believed to be a sin
    "he said it was sinful to wear lipstick";
    - iniquitous, ungodly
  2. Having committed unrighteous acts
    "a sinful person";
    - unholy, wicked
  3. Far more than usual or expected
    - extraordinary, over-the-top

See also: immoderate, unrighteous, wicked

Encyclopedia: Sinful