unimpeachable
C1CEFR level
75/100Rarity: rare
FormalRegister
General adjective
Beyond all doubt or reproach in honesty and integrity.
The witness had an unimpeachable reputation that no cross-examination could dent.
Law adjective
Beyond doubt or reproach and not open to being discredited.
The provenance of the ledger was unimpeachable, having been held by the bank throughout.
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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