"quick to doubt" is a correct and usable phrase in written English.
You can use it to describe someone who is quick to suspect or think ill of someone else without further investigation. For example, "She was quick to doubt her husband's fidelity when he came home late one night."
All the callers accused us of being too negative, and too quick to doubt South Africa.
Well, the Easter Bunny has his own movie coming out any minute – Hop, starring Russell Brand – so don't be so quick to doubt your instincts on this issue.
"Of course the younger players need to learn but when you don't win as a German footballer people are always quick to doubt your determination.
Mr. Strauss-Kahn's accuser, Ms. Diallo, is Fulani, so the accusations of sexual assault reopened the community's wounds: After the case made headlines, New York's Fulani population rallied behind Ms. Diallo, while Mandinkas were quick to doubt her claims.
The Independent is quick to doubt Russia, noting that while some insist "Moscow is pursuing a solution of its own" by pushing for peace talks, "it remains unclear whether such efforts are genuine or merely a ruse to pre-empt the U.N".
Bright girls were more easily intimidated, and quicker to doubt their ability.
Whatever potential harm we now believe bread is doing, if it's so satisfying, so enjoyable, and so pleasurable to eat, why would we be quicker to doubt those impulses than the supposed "progress" that tells us how harmful it is?
And while not everything that happens in court can be revealed, we have obviously been too quick in the past to doubt any strength in a right to know.
But leading thinktanks have been quick to cast doubt on the chancellor's plans.
But as Syriza celebrated its win on Sunday, many in Spain were quick to cast doubt as to the extent to which Syriza's victory would bolster Podemos's chances of being elected.
Inspector Bob Lands at Redbridge says that police have received letters of praise from residents for targeting sex workers but is also quick to express doubt over the enforcement campaign.
