rad
really cool, but in a more subtle way. as opposed to extreme or awesome. one of the highest compliments you can give someone. being rad is like being cool without having to work for it. it's like a natural coolness.rad
rad
a unit of absorbed dose of ionizing radiation, corresponding to the absorption of 0.01 joule per kilogram of the absorbing material.
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Several definitions given here are correct in connecting the term to radical but incorrect in the date of origin. Being old enough, I can attest that it was used at least as far back as the seventies.
Example:
"The Ninja Turtles never invented a single term. To suggest so is not rad but very uncool."
"The Ninja Turtles never invented a single term. To suggest so is not rad but very uncool."