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From rum- (strong, very) +‎ bust +‎ -ious.

Alternatively, possibly from an alteration of robustious.


rumbustious (comparative more rumbustious, superlative most rumbustious)

  1. (chiefly British, informal) Boisterous and unruly.
    Synonym: (chiefly US) rambunctious
    • 1912, Blanche Edith Baughan, “Red and Yellow and Ripe”, in Brown Bread from a Colonial Oven:
      “Childer! Borne ’em I ’ave, an’ buried ’em I ’ave, but now I can’t seem to do wi’ their clatter no more—young things is that restless an’ rumbustious.”

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