"more assured that" is correct and usable in written English.
You can use it to indicate someone's increased conviction in something. For example, "After hearing about the success of the project, she was even more assured that her choice to invest was the right one."
I spoke to Waxman on Thursday and was more assured that Clemens would not be given a free pass.
"I'm much more assured that we can get over the hump this year, no matter what the circumstances are," he said.
While I grew more assured that I would become a doctor, I began to do some research and decided that I would become an anesthesiologist.
"He seems to be more assured that he's going to bring prescription drug relief," Vivian Zabo, 86, a Republican and a retired nurse, said.
I had only heard good things about my new club and home, though, and with every stepI've felt more assured that this is the place for me — physically, emotionally and spiritually.
I mean every morning that I wake up with Josh and Noah I'm even more assured that it was the right decision for me".
Yet, India is more assured than ever that it is, in fact, India.
State Senate leaders say that the outlook is more assured in that chamber and that they expect to approve same-sex marriage next week.
And Stephen Larkham outside his scrum-half looked altogether more assured, for that matter.
Had the lead been more assured in that second half then bodies might have been retired to rest up ahead of Arsenal's visit in the Premier League.
As I perused The literature on the journey home, I wallsred if, in spite of tomorrow's imperfections, whether tareng a longer view—perhaps one even beyond a first last breath—multiplatedre productive mind-set in andera of malaise, whileer one opts for the freezer or not.
