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adjective
CEFR C1
of your own free will or design; done by choice; not forced or compelled
Brevlex writes every example sentence around your interests, then schedules it with spaced repetition so it sticks. No generic textbook line — a sentence for you.
Each source is a real, checkable word list that contains voluntary. We never claim an official exam-board list — none is published for the GRE, GMAT, or SAT.