My besetting fear was that I couldn't count on her obtuseness.
For all the agitation that must have been besetting him, his manner was serene as ever.
For the besetting irresoluteness of the Gumthorpes is consuming him.
But if a quick temper was Roger's besetting sin, pig-headedness was Ernest's.
Diderot was more free from this besetting weakness than any of his contemporaries.