"highly trustworthy" is correct and usable in written English.
You can use it to describe someone (or something) that you consider to be very reliable and dependable. For example: "My accountant is highly trustworthy and I know I can always rely on her advice."
Highly trustworthy, he could engage people in very candid conversations about business challenges.
The researchers examined 79 randomised trials of omega-3 fats, of which 25 were considered highly trustworthy because they were designed and carried out well.
This process resulted in Iridium, a highly trustworthy protein ligand structure database to be used for development and validation of structure-based design tools for drug discovery.
In this situation, modeling approaches that use such a clear-cut criterion as the steric tension can give us highly trustworthy results.
Like thousands of other parents, Penny Wrinch handed over her debit card details to allow her "highly trustworthy and technically savvy" son Nick to buy games for the family Google Nexus tablet.
Richard von Schirach has refused to identify the man who delivered the second ring to his father, but Mr. Rathkolb said he has been approached by a "highly trustworthy and well-informed witness" who will identify him.
Only New York had the experienced underwriters, the highly transparent, trustworthy markets and the deep pool of capital to handle such a deal.
This will help you to non-verbally create an instant connection and build rapport; and not only that, you will also be perceived unconsciously as someone who is highly confident, trustworthy and likeable," explains Ford.
"Users are getting that true sense of who someone is through a highly accountable and trustworthy network".
Ofcom said the BBC was generally delivering on its remit, and audiences rated the BBC's news output particularly highly for providing trustworthy and reliable news and current affairs material on TV, radio and online.
The chain of narrators is said to reach Muhammad ibn Jumhoor or al-Hassan ibn Muhammad al-Nawfali who is described as "highly esteemed and trustworthy" by al-Najjashi.
