The phrase "strong propensity" is correct and usable in written English.
You can use it to describe a particularly strong inclination towards something. For example, "My strong propensity for classical music led me to pursue a career as a professional violinist."
The result is a strong propensity for holding grudges.
In some of her rulings, the judge has shown a strong propensity to protect individual rights.
Readers also have a strong propensity to buy European cars, the survey found.
In various evolutionary lines in frogs, there is a strong propensity to breed away from water.
That is crucial because users have a strong propensity to pick from among the top few ads.
In addition, this administration has shown a strong propensity to swagger and attack rather than to negotiate and use diplomacy.
I say "curiously" because until now Nuland has been a writer with a strong propensity for facing unpleasant facts and passing them along to his readers without trimmings.
They have a strong propensity to save their money for future needs and to invest in the education of their siblings and children.
He said some of arrests demonstrated that Mr. Dorismond had "a strong propensity for violence" that was relevant to the question of what had happened on Eighth Avenue between Mr. Dorismond and the police officers.
"The brain has a strong propensity to organize information and perception in patterns, and music plays into that inclination," said Michael Thaut, a professor of music and neuroscience at Colorado State University.
"There's no doubt that there's a strong propensity for money to find the unregulated outlet," said Frank J. Sorauf, an emeritus professor of political science at the University of Minnesota.
