American Heritage Dictionary
(3)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
While dubious, the word "they" is increasingly being used as a gender-neutral singular pronoun in place of the awkward "he or she" and "he / she".
On the Hill, doubts ran deep at a Congressional hearing called to question the Bush administration policy of arming what most American analysts and commentators have begun to refer to as a dubious ally and terrorist haven that constitutes a threat to the United States.— The Times of India
It wouldn't be so bad if the dubious products and services were obviously dubious, and thus easily avoided.— Find Free Articles - ArticlesBase
Not only is that totally dubious --— MVN
Here's a vid of the Acekard's flashcart for the dubious:— QJ.NET

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a week.
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