"circumspect of" is a correct and usable phrase in written English.
It usually means to be very careful or cautious when making or considering a decision. Example: With the upcoming election, I am being very circumspect of the candidates' platforms and positions.
Some ArtsBeat readers were circumspect of Current's selections.
Usually the most circumspect of scientists, he finally erupted.
Democrats also remained circumspect of the deal but reserved judgment pending further review of the details.
Mr. Bayou was circumspect of Halston's motives, saying, "That was an obvious attempt to save a label about to drown".
She went on to say that the Swedish teacher's answer was a eureka moment for her: Luker had "never heard any American participants in the sex-ed debates, whether teachers, students or parents, mention either sexual desire or sexual pleasure, except in the most circumspect of terms".
There was also a group of employers in sectors which had little tradition of apprenticeship training who were a lot more circumspect of the relevance of this type of training to their particular needs.
And he introduces a cast of Dylan disciples: circumspect keepers of secret bootleg recordings, feuding editors of Dylan zines and Web sites, literary detectives sourcing allusions in his lyrics, and a guy who owns Dylan's childhood high chair.
That Plato lets Socrates express reservations concerning the adequacy of his own procedure (435c d), despite his unusually circumspect way of justifying his division of the soul's faculties, indicates that he regards it as an important innovation.
And unlike, say, the imperious Jerry Jones of the Dallas Cowboys or the more circumspect Bob Kraft of the New England Patriots, Harlan doesn't actually own the levers of the team he runs.
He improved the Arabic translation of the Theology of Aristotle but made only a selective and circumspect use of it.
The notion persists to this day that Darwin was a circumspect observer of animals, not a confident theorist of life.
