…of framed photographs, yellowing personal and Presidential correspondence, bronze and silver plaques, and a sprawling miscellany of vaguely citational-looking documents and trophy like objects of various shapes and sizes, all attesting, one way or another, to the redoubtable fact that from 1927 through most of 1943 the network radio program called "It’s a Wise Child" had very rarely gone on the air without one (and, more often, two) of the seven Glass children among its panelists.
There are no more uses of "redoubtable" in the book.
Show samples from other sources
They remain, I suspect, a redoubtable seduction tool.
Khaled Hosseini -- And The Mountains Echoed
To the youth it was an onslaught of redoubtable dragons.