Top Definition
Previously unknown; Never heard before: Unheard previously
- "Can you believe that Katie got an F on her test last week?"
- "No way! That is unsound-of!! She always gets As."

- "Last night, little bear didn't want to cuddle.."
- "That's unsound-of! Cuddling is little bears favorite thing!"
by Smart Blonde Cookie September 13, 2011

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