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un·briefed | \ ˌən-ˈbrēft 
\
\Definition of unbriefed
: not briefed: such as
a : not provided with instructions or information in a briefing
The pilots, unbriefed about their mission, flew due east over the Atlantic Ocean for 60 miles. — The St. Louis Post-Dispatch
b : not discussed in a briefing
an unbriefed issue
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Merriam-Webster unabridgedWords at Play
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The first known use of unbriefed was in 1889
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