The phrase "deceitful about" is correct and can be used in written English.
It means that someone is being dishonest or trying to deceive others about something. Example: She was always deceitful about her age, often pretending to be younger than she actually was.
I think he was willing to be deceitful about it because he thought it was right".
One difficulty in trying to discover the motives behind socially unacceptable behaviour is that the individuals in question will usually be reticent or deceitful about their motives – even to themselves.
The first is that Robinson, cash cow to his influential Labour friends, himself got £200,000 from the crooked Robert Maxwell and has been deceitful about it ever since.
Along with JPMorgan Chase, Citigroup is fighting claims totaling $1.5 billion from a group of several other big banks that has accused Citigroup of being deceitful about Enron's finances in its role as principal agent for the group.
And Mr. Giuliani exhibits bluster in the advertisement as he portrays the Democrats as perpetually tax-raising and, on top of that, deceitful about their plans to do so.
"There is something that you are suppressing or not giving attention to or actively being deceitful about within yourself.
Everything appeared deceitful or even fraudulent about the politicians -- Democrats all -- who ran the city and county.
But the leaders of eight prominent Muslim American organizations, including the two groups involved in the Clinton-Lazio dispute, put the blame on Mr. Lazio for introducing "racism and bigotry" into the Senate race and using "deceitful accusations" about Muslims to promote his candidacy.
On May 7, executives from the country's largest insurers – Aetna, WellPoint and Health Care Service Corp. – testified that the GOP had jumped to deceitful conclusions about Obamacare premium payment rates.
If he has a history of being deceitful even about mundane issues, then yes, it is probably inherent in his personality and you have to either accept him for this trait or move on.
In the dedication for the reissue of The Heart Is Deceitful Above All Things, I say that the things I write about are happening to people all the time.
