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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
See the etymology of the corresponding lemma form.
acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp
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tap / space
Classic usage
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Verbault — Brown corpus levels, WordNet definitions, Gutenberg corpus.
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