The phrase "cynical of" is correct and usable in written English
You can use it to describe someone's attitude toward an idea or opinion. For example: "He was cynical of the promise that things would get better."
"It made me very cynical of wisdom".
Most women here are cynical of his about-turn.
THE making of New Year's resolutions is, at once, the most optimistic and cynical of acts.
Most of them seemed cynical of the government's ability to purge the current system of corruption.
Unsurprisingly, no one is more cynical of the Pakistanis than the Indians.
The operations were often half-hearted, leaving the tribal people deeply cynical of the army's intentions.
"And they were deeply cynical of Western rhetoric on human rights.
He then asked, rhetorically: "Now is that excessively cynical of me?
"It's incredibly cynical of Erdogan to cite C.P.J. as proof of press freedom," Simon said.
Since this time the public has become ever more cognisant (and sometimes cynical) of official statistics.
Is it very cynical of me to suggest it fitted the narrative a little too neatly?
