(adj.) - skeptical; questionable
Doubtful.
doubtful, suspicious, dubious, unsure, uncertain
The lady was very dubious of the children's allegations.
credible
He gave a dubious explanation for his absence from the meeting, raising suspicions among his colleagues.
The plan to separate the world into nations was quite dubious. Definition is here: http://www.merriam-webster.com/dictionary/dubious
demirep
truer
(dubious means of uncertain truth or validity)Examples :The validity of the document was somewhat dubious.I was rather dubious about the reasons he gave for his absence.
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Doubtful, specious, skeptical