mettle
C1CEFR level
58/100Rarity: uncommon
FormalRegister
A person's spirit, resilience, and courage when tested.
The long siege tested the mettle of every soldier on the wall.
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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