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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From worthwhile + -ness (suffix attached to adjectives forming nouns meaning ‘the measure of being [the adjective]’ or ‘the quality or state of being [the adjective]’).
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Classic usage
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Verbault — Brown corpus levels, WordNet definitions, Gutenberg corpus.
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