éminence grise
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
A powerful adviser who exerts influence privately, from behind a nominal leader.
The CEO gets the headlines, but the chief of staff is the éminence grise who actually sets the agenda.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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