This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Fraught with uncertainty or doubt; undecided.

adj. Arousing doubt; doubtful: a dubious distinction.

adj. Of questionable character: dubious profits.

adj. Arousing doubt; questionable; open to suspicion.

adj. In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided.

adj. Doubtful or not settled in opinion; being in doubt; wavering or fluctuating; undetermined.

adj. Occasioning doubt; not clear, or obvious; equivocal; questionable; doubtful.

adj. Of uncertain event or issue.

Doubting; hesitating; wavering or fluctuating in opinion, but inclined to doubt.

Doubtful; marked by or occasioning doubt or uncertainty; difficult to determine or relieve of uncertainty; not distinct or plain; puzzling: as, a dubious question; a dubious light.

Of uncertain event or issue: as, a dubious undertaking.

Liable to doubt or suspicion; of doubtful quality or propriety; questionable: as, a man of dubious character; a dubious transaction; his morals or his methods are dubious. Synonyms Unsettled, undetermined.

Doubtful, Ambiguous, etc. (see obscure, a.); questionable, problematical, puzzling.

adj. open to doubt or suspicion

adj. fraught with uncertainty or doubt

adj. not convinced

"And Dr. Fauci, I know that you would maybe argue, by the way, about the term dubious quality control."

questionable    uncertain    unsure    incertain    unconvinced   

(?)   

dubiousness    dubious honor    dubious honour    dubiously   

unsettled    uncertain    doubtful    equivocal    undetermined    doubting    questionable   

indubious   

doubtful    uncertain    ambiguous    speculative    political    only    peculiar    contradictory    worldly    exceptional