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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English stiffenes, styffenesse, styfnesse; equivalent to stiff + -ness. Perhaps merging with Middle English stithnesse, stithnysse, from Old English stīþness (“stiffness”).
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Classic usage
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