"cast strong doubt" is an appropriate phrase to use in written English.
It is typically used when expressing skepticism about something. For example, "His alibi casts strong doubt upon the idea that he was the perpetrator of the crime."
The Russian leader cast strong doubt on America's choice of allies in the antiterror campaign.
Low coal prices have led many analysts and major investment banks to cast strong doubt on the project's viability.
But wait, other news organizations have now weighed in to say The Times's coverage of the BM-25 missiles was misleading, that other authorities have cast strong doubt on whether such missiles even exist.
In rejecting the argument that individual acts of violence against women had, in the aggregate, a substantial effect on commerce, the court cast strong doubt on the theory by which the Seventh Circuit had endorsed the migratory bird rule.
Donna Hawkins, a spokeswoman for the district attorney's office, said the state was not ready to concede Mr. Sonnier's innocence, though prosecutors acknowledge that the new DNA tests cast strong doubt on the conviction.
TOKYO--A team of archaeologists has cast strong doubt on claims that a cave in western Japan contains evidence of early human habitation.
After skyline images of New York bearing a threatening message about the return of Al Qaeda drew police and media attention, terrorism experts on Tuesday cast strong doubts on their credibility.
Western nations have also cast strong doubts on the Syrian government's claim, and have said that any investigation should also include claims by anti-Assad activists that the government has used chemical weapons in the city of Homs and the Damascus suburbs.
A voluminous body of research has cast strong doubts on the claims that juvenile curfew laws prevent victimization or reduce juvenile crime, but these findings have received scant attention from policymakers or police.
In both systems evidence has been produced which cast strong doubts on any role played by absorbed (or adherent) impurities.
Indeed, the figures have been repeatedly revised, even over quite short periods of time, casting strong doubt on the validity of the economic models being used.
