Definition the degree of prudence that might be properly expected from any reasonable person in the circumstances
He did not exercise due diligence when investing her money.
It is my desire, as I'm sure it is Layken's desire as well, to be punctual, so that we may serve our fairly deserved sentences with due diligence.
Colleen Hoover -- Slammed
We had to act with due diligence.
Dean Koontz -- Sole Survivor
From my presurrender due diligence, I knew it was verboten to ask anyone about their crime.
Piper Kerman -- Orange Is the New Black
All day at work he counted numbers—due diligence for a Chadds Ford insurance firm—and at night he built the ships or read Civil War books to unwind.
Alice Sebold -- The Lovely Bones
And we need to get this due diligence thing worked out before Martin gets in—
Jojo Moyes -- Me Before You
When, weeks later, she remarked on this, Robert ruminated a moment, as she recalled him doing before declaiming details from the Dakar flight directory, and replied in perfect seriousness that he'd always believed sex, like the law, was best practiced with all due diligence.