"dishonest about" is a correct and usable phrase in written English.
It means not being truthful or sincere about something. Example: I don't trust him because he is always dishonest about his intentions.
The ad does not explain what she is being dishonest about, but it does trot out what appears to be a new tag line, in which Mr. Brown says, "I'm nobody's senator but yours".
"What's dishonest about her?" I asked.
But there was nothing dishonest about how he felt.
"I was never dishonest about my education," she said.
There's something dishonest about the master-disciple relationship.
Technically, there's nothing dishonest about the use of my rating.
One cannot be sincere and at the same time dishonest about something not essentially trivial.
He turns out to have been dishonest about when he really left Bain.
Anyway, those are things that people shouldn't be dishonest about it".
"Governor Romney has been dishonest about his plans on issue after issue.
Grandma didn't know that there was anything dishonest about helping backward boys even for a fee.
