...On the otherhand, that city had also a strong interest in facilitating their transithomeward, and thus removing formidable neighbors, for whose ulteriorpurposes there could be no guarantee... 
George Grote 「The Two Great Retreats of History」
...The other, with the armourflowered with gold, who bears three crowns argent, in a fieldazure, is the formidable Micocolembo, Grand Duke of Quiracia...
Miguel de Cervantes Saavedra 「The History of Don Quixote de la Mancha」
... Porthos colored in a formidable manner...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...It was customary for the admiral and his suite to embark last; the cannon waited to announce, with its formidable voice, that the leader had placed his foot on board his vessel...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...Then the formidable lever rose ten times in ten seconds, and made ten corpses...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...Thus you behold him not merely famous, but really formidable...
Rafael Sabatini 「Captain Blood」
... “If the windmill should prove too formidable,” said he, from the threshold, “I may see what can be done with the wind...
Rafael Sabatini 「Scaramouche」
...It was not avery formidable animal—only a hare; but it marked an epoch in herexistence...
Edgar Rice Burroughs 「Tarzan the Terrible」
... He saw the formidable creature rise to a standingposition...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
...For a moment their most formidable antagonist was the officer incommand...
Edgar Rice Burroughs 「Tarzan the Untamed」
...The wretched people, though they were surprized, made a formidable resistance, as they resolved, almost all of them, rather to lose their lives, than survive their liberty...
Thomas Clarkson 「An Essay on the Slavery and Commerce of the Human Species, Particularly the African」
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