abstruse
C2CEFR level
84/100Rarity: very rare
FormalRegister
Difficult to understand because of profundity or obscurity.
The lecture on quantum field theory was too abstruse for the general audience.
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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