dubiously

In questionable fashion

Dubiously means in a manner showing doubt or skepticism: She looked at him dubiously when he claimed to have finished the project.

It can also describe something done in a questionable or suspect way: a dubiously sourced statistic, dubiously acquired wealth.

The word signals that something doesn't quite pass the smell test.

skeptical

skeptically

With doubt or distrust

suspiciously · cynically · distrustfully · questioningly · mistrustfully · warily · leery · jaundiced · scoffingly · dismissively

uncertain

uncertainly

In a doubtful way

indecisively · waveringly · haltingly · falteringly · irresolutely · noncommittally · ambivalently · inconclusively · doubtfully · shakily

questionable

suspiciously

With apparent distrust

sketchily · shiftily · underhandedly · dishonestly · unethically · disreputably · illicitly · improperly · irregularly · unscrupulously

ambiguous

vaguely

In unclear fashion

indistinctly · murkily · hazily · indefinitely · inconclusively · equivocally · cryptically · enigmatically · confusingly · puzzlingly

Opposites
certainty/confidence

dubiouslycertainly

Without any doubt

confidently · definitely · unquestionably · assuredly · undoubtedly

skepticism/trust

dubiouslytrustingly

With naive belief

trustfully · credulously · uncritically · unquestioningly · naively

approval/judgment

dubiouslyapprovingly

With positive regard

favorably · positively · enthusiastically · admiringly · supportively

Phrases
Family

dubious, dubiousness

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G