"increasingly more confident" is correct and usable in written English.
You can use this phrase when you want to express that someone has become more and more sure of themselves over time. For example: "Over the past few months, I have become increasingly more confident in my decision-making."
But when oil prices jumped back to more than $30 a barrel after the last production increase, exporting countries became increasingly more confident.
"While many policy makers have described recent commodity cost increases as 'transitory,' the reality is that even at the small-business level, producers are increasingly more confident in their ability to pass on costs to customers," Joseph LaVorgna, chief United States economist at Deutsche Bank Securities in New York, said in a note to clients.
After months of uncertainty about when, or if, the school might reinstate its athletic program on a limited basis, Barrera is increasingly more confident that there will be sports at the Sylmar school.
These observations are consistent with the hypothesis that as individuals had more opportunity to practice the material they had learned, they could reinforce it and feel increasingly more confident and communicate with patients more comfortably.
Foreign investors recognize the potential of Chinese manufacturing might and increasingly feel more confident about putting money into Chinese ventures as China gradually embraces a market economy and introduces more transparency.
When you pay attention to your thoughts, emotions and the various manners in which you manage your educational responsibilities, you will become increasingly more competent and confident in the challenges that lie ahead for you.
Some parents purchased computers specifically to search the internet for CKD-specific information, and as children use the internet at an increasingly young age, some being more confident at this than parents, some parents relied on children's help to seek online CKD-specific information [ 8].
During the next few years, working mainly in watercolor, Ford became increasingly skillful and a great deal more confident.
Economic stability and growth, and an increasingly solid democracy, have recently made Brazilian governments more confident about acting as the regional superpower but through diplomacy.
In his strongest intervention on religion to date, Mr Cameron said that in an increasingly "secular age" Christians need to be even "more confident" and "ambitious".
For instance, the respondent from S3 stated: BCM has helped us to increasingly meet customers' expectations… our stakeholders are now more confident that business objectives will be achieved with less disruptions through the existence of a detailed continuity plan.
