...He did not much relish the idea of alone tackling the redoubtable Umhlonhlo, a savage of muscle, who was reported to be always armed to the teeth... 
Various 「Stories by English Authors: Africa」
...In many cases the extreme resort must be had of cutting the fetus to pieces(embryotomy), or the still more redoubtable one of Cæsarean section (extractionthrough the flank)...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Leather with the redoubtable horses by the road, intendingto follow in as many hours by the rail as it took them days to trudge onfoot...
R. S. Surtees 「Mr. Sponge's Sporting Tour」
...But it was the sudden tonk-tonking of the bell, not thechallenge of his redoubtable mother, that had put the fierce-eyedprowler to flight...
Charles G. D. Roberts 「The Watchers of the Trails」
...Nickel is commonly found in iron meteorites, so that it might be said that that redoubtable alloy nickel-steel is of cosmical invention...
Garrett Serviss 「Curiosities of the Sky」
...With the suddenness and severity of a horse-kick, it lashed out with its right hand, catching the redoubtable Dooley a thud on the jaw, and sending him to grass as if he had been shot...
Andrew Barton 'Banjo' Paterson 「Three Elephant Power」
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