Englishfor English speakers
doubtful
—
adjective
(= dubious, dubitable)
open to doubt or suspicion
the candidate's doubtful past
he has a dubious record indeed
what one found uncertain the other found dubious or downright false
it was more than dubitable whether the friend was as influential as she thought
— Karen Horney
—
adjective
(= dubious)
fraught with uncertainty or doubt
they were doubtful that the cord would hold
it was doubtful whether she would be admitted
dubious about agreeing to go
—
adjective
(= tentative)
unsettled in mind or opinion
drew a few tentative conclusions
data
Noun
—
Data is information, such as facts, numbers, photographs, etc.
A study using experimental data from ten schools found no difference between methods.