Definition of dubious
1
: unsettled in opinion : doubtful
I was dubious about the plan.
2
: giving rise to uncertainty: such as
a
: of doubtful promise or outcome
a dubious plan
b
: questionable or suspect as to true nature or quality
the practice is of dubious legality
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Merriam-Webster unabridged
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The first known use of dubious was in 1548
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