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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Of multiple origins: * Borrowed from Latin portentōsus, from portentus (“predicted”) + -ōsus. Compare earlier portentuous (via Middle English from Latin portentuōsus). By surface analysis, portent + -ous. * Borrowed from French portentueux
prodigious
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Classic usage
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