assiduous
C2CEFR level
65/100Rarity: rare
FormalRegister
Showing great care, persistence and unremitting attention in whatever one does.
Her assiduous cross-checking of every figure meant the audit turned up errors three other reviewers had missed.
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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