unleaded

/ʌnˈlɛdɪd/
adjective
  1. Containing no lead; especially referring to fuel that does not have lead added.
    • Unleaded paint is safer for children's toys.
    • The mechanic recommended using only unleaded fuel in the new engine.
    • Most cars today run on unleaded gasoline.
Antonyms
noun
  1. Fuel that does not contain lead.
    • The price of unleaded has gone up again this week.
    • I need to fill up the car with unleaded.
    • Make sure you put unleaded in the tank, not diesel.