Redoubtable

She was politely described as a redoubtable dowager.

Overcoming severe radiation damage, the redoubtable orbiter has deployed a probe into Jupiter's atmosphere; studied the hottest volcanoes in the Solar System on Jupiter's moon Io; discovered evidence of subsurface oceans on the moons Europa and Ganymede; and provided new insights into the giant planet's stormy atmosphere, gigantic magnetosphere and energetic particle environment.

The redoubtable New York Times has been called the “newspaper of record” of the United States.

VVhere ſuch an other Rodomont, ſo furious, ſo valorous, ſo redoutable?

This new batch was sent to Leicester shed, and the redoubtable enginemen who had made such a reputation for themselves with the ex-G.C.R. Atlantics took to the "B17s" immediately, although, of course, they required quite different driving methods; […].

Three local yobs have also joined, but they have not reckoned on a redoubtable Conductor and two local revenue protection officers who soon escort them off the train!

[I]t pleaſed the grekes at that tyme to ſe yͤ body of Hector ſo trayned by Achilles⸝ bycauſe he was wont to be ſo redoubtab[l]e to them⸝ […]

Revers'd that ſpear, redoubtable in war, / Reclined that banner, erſt in fields unfurl'd, / That like a deathful meteor, gleam'd afar, / And brav'd the mighty monarchs of the world.— […]

Inwardly she quaked, because she dreaded and admired the calm, self-contained character of her daughter Winnie, whose displeasure was made redoubtable by a diversity of dreadful silences.

Had you sought the Lady's court yourself.— / Faced the redoubtables composing it, / Flattered this, threatened that man, bribed the other,— / Pleaded, by writ and word and deed, your cause,— / Conquered a footing inch by painful inch,— / And, after long years' struggle, pounced at last / On her for prize,—the right life had been lived.