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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Uncertain but probably variation of robustious (“robust, large, noisy, violent”), from robust + -ious. Alternatively, from rum- (“nonsense syllable”) + bust + -ious.
boisterous, rambunctious, robustious, unruly
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Classic usage
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