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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English rigide, from Latin rigidus (“stiff”), from rigeō (“to be stiff”). Compare rigor. Merged with Middle English rigged, rygged, rugged (“upright like a spine, rigid”, literally “ridged”), from ridge + -ed.
stiff
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Classic usage
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