"vigilant with" is a perfectly acceptable phrase in written English.
For example, you could write: "I have to be vigilant with my spending if I want to make sure I'm saving enough for a house down payment."
Be especially vigilant with unsympathetic characters.
Michael's competitors were disreputable, he said, and he needed to be vigilant with potential clients.
Biya called on Cameroonians to be vigilant, with the attacks the second this month.
"You need to be very vigilant with this sort of thing," the doctor is saying.
"I said they have to be extraordinarily vigilant with their lives.
We're always concerned we'll spread them but we're vigilant with protective clothing.
She is vigilant with the TV remote, though, quickly clicking away from images of the twin towers.
"We are going to have to look into ways to be more vigilant with security," he said.
There is a fleeting sweet spot with banana ripeness, so you have to be vigilant with your fruit bowl.
Human rights advocate Tim Soutphommasane wants Australians to be vigilant, with nativism and nationalist populism on the march.
Nursing professionals need to detect psychiatric disease of family members and must be especially vigilant with people who have low resourcefulness and sleep disturbances.
