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 unabridged
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Time Traveler for unbriefed
The first known use of unbriefed was in 1889
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