The phrase "adds doubt" is correct and usable in written English.
It can be used when discussing something that creates uncertainty or skepticism about a situation or statement.
Example: "The lack of evidence in his argument adds doubt to his claims."
Alternatives: "creates uncertainty" or "introduces skepticism."
The findings of this study show a very low level of concordance between subjectively rated and objectively measured soil moisture levels and therefore adds doubt to some of the previous studies purporting the link between sports injury risk and soil moisture (Cromwell et al. [2000]; Hagel et al. [2003]; Andresen et al. [1989]).
But it also adds doubt to claims that the shooter targeted Christians, as some witnesses have implied. .
The members of the public who disliked it stated 'difficult to understand – may confuse a patient', 'verbally confusing', and 'it does not explain the allocation process and it adds doubt to confusion'.
When students were frisked and had to walk through metal detectors, it added doubt and suspicion.
Richard Glossip has exhausted both state and federal appeals, and Oklahoma Governor Mary Fallin has said she won't intervene in the case, despite fresh information adding doubt to his contested conviction.
At the same time, academic trends such as the growth of historical biblical criticism tend to cast added doubt on many of the accounts of miracles in the Bible.
Until then, the source added, doubts will remain.
To all that, add doubts, at least in the short-term, about the viability of stationary fuel cells.
"Susan's success," Cole adds, "no doubt suggests hope to others who may also exhibit a combination of special abilities and disabilities".
The scandal surrounding Kabul Bank, which was bailed out by foreign lenders, adds to doubts about the strength of Afghanistan's institutions.
Ms. Wang's writing adds to doubts that have been raised about the trials of Ms. Gu and Wang Lijun, the former police chief.
