There is no circumlocution nor ambiguity of expression here.
James never noticed anything—or if he did, his ambiguity was two-edged.
Obscurity in a teacher is a great defect, especially when he glories in his ambiguity.
He found an ambiguity in the wording, a choice of constructions.
Even the term "expression" has a certain amount of ambiguity.
It was also free from ...