The phrase 'formidable strength' is correct and usable in written English.
It is often used to describe something that is very powerful and difficult to overcome. For example, "The team faced their opponents with a formidable strength, but ultimately could not win the match."
And yet she has a formidable strength.
But the Giants had formidable strength off the interchange bench and their greater bulk and experience started to grind down the Wigan youngsters as the first half proceeded.
Mr. Sweeney said unions needed to show gains for several more years before labor began to regain some of the formidable strength it once had.
This superstar has summoned all her formidable strength, charm and self-discipline to prove that she is, beneath it all, a fragile artist buffeted by the winds of fate and hyperfame.
Yet the Old Doctor, as Dominicans called him, kept wirily bouncing back.No one quite knew where his formidable strength resided; looking through those thick lenses, into those expressionless eyes, you could not fathom him.
Chelsea, similarly, will be confident of progression with their possible opponents – the same as City's, but Juventus instead of Kiev – all lacking the formidable strength of Barça or Bayern.
But he has formidable strengths to fall back on.
Experts caution, however, that it is important to see the weaknesses of Isis as well as its formidable strengths.
Introducing pay for performance would add entrepreneurial vim to Japan's formidable strengths in technology and team spirit.Changing corporate cultures is hard, but not impossible.
Tony was always the more rounded figure, and in my view a remarkable political leader, but Gordon also had formidable strengths".
She has formidable strengths — including a popular ex-president by her side — and the threats facing the country in 2008 are more shadowy and, some would argue, tactically challenging than in 1960.
