A stupid, clumsy fellow.

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1854.  Man, in his original state, is little more than a big lummux of a baby.—Dow, Jun., iv. 149.

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1857.  I hope you’ll leave somebody else to home besides this lazy lummox.—J. G. Holland, ‘The Bay-Path,’ p. 381.

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1871.  I would trust [the Roman cart-horse] to keep on pulling, long after your mere lummoxes had fallen in their shafts.—Old and New, June (de Vere).

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