1. What's more, the stain of dubiousness may remain on all AIDS vaccine research and development.
noun
1. dubiousness
1. uncertainty about the truth or factuality or existence of something
e.g. the dubiousness of his claim
there is no question about the validity of the enterprise
Synonym: doubt doubtfulness question
2. dubiousness
2. the state of being unsure of something
Synonym: doubt uncertainty incertitude dubiety doubtfulness