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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English waccheful, equivalent to watch + -ful. Compare West Frisian waaks (“watchful”), Dutch waaks, waakzaam (“watchful”), German wachsam (“watchful”), Swedish vaksam (“watchful”).
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Classic usage
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