"formidable manner" is a correct and usable phrase in written English.
It is typically used to describe someone's way of behaving or carrying oneself that is impressive, intimidating or powerful. Here is an example of how it could be used in a sentence: "Despite being a novice politician, he entered the debate with a formidable manner, speaking confidently and commanding the attention of the audience."
A formidable appearance and manner became central to the family's sense of itself; in an early portrait, Otto's father, Markus, a distinguished lawyer, appears with waxed mustaches pointing upward like raised swords.
I wasn't indexing myself against the people around me". Andreessen reminded me — in his formidable achievements and manner, his thickly armored sensitivities and yearnings — of Rilke's remark "Perhaps everything that frightens us is, in its deepest essence, something helpless that wants our love".
Although formidable in appearance and manner, Mr Clarke is not quite the cabinet bruiser he is cracked up to be; he is a rather complaisant minister with a reputation for going native in the departments he has been given to run.
What would it have taken for Venezuela to set up a meaningful oil-stabilisation fund?China: Watch what you sayThe Communist Party wields its formidable power in all manner of ways, successfully muting or softening criticism from CEOs and world leadersCulture: House-builderNo one ever truly invents a new style of music.
Vivacious yet discreet, quick-witted but idiosyncratic, on occasion formidable, she had exquisite manners and a faultless grasp of etiquette — and she expected the same standards of others.
Intending to show Connor as a formidable fighter, Kelly A. Manners described him as "quite the hunter, quite the killer".
This is surely down to the laser political vision of Abreu, whose tiny form and Mother Theresa-esque manner belie a formidable, strategic intelligence.
Casino mogul Steve Wynn, more than anyone else the maker of the modern Strip, planned in the 1990s to connect all his properties in this manner, but the formidable Caesars Palace, which stands between Wynn's Mirage and Bellagio, refused him permission to cross its property.
Mitt Romney 2.0 is a slick and formidable candidate — c.f. the impressive manner in which he turned around Perry's question about his controversial Massachusetts health-care plan, pointing out that Texas now has more than a million children without health insurance, and ending with the statement, "I care about people".
