English Thesaurus

Synonyms of 'dubious'

(adjective) 
Definition
of doubtful quality or worth
dubious business dealings
Synonyms
suspect
Delegates evacuated the building when a suspect package was found.
,
suspicious
two suspicious-looking characters
,
crooked (informal)
She might expose his crooked business deals to the authorities.
,
dodgy (British, Australian, New Zealand, informal)
, ,
unreliable
She had proved to be an unreliable witness and had lied to police.
,
shady (informal)
Be wary of people who try to talk you into shady deals.
, ,
fishy (informal)
There seems to be something fishy going on.
, ,
untrustworthy
His opponents still say he's a fundamentally untrustworthy figure.
,
Opposites
(adjective) 
Definition
unsure or undecided
My parents were a bit dubious about it all.
Synonyms
unsure
Fifty-two per cent were unsure about the idea.
,
uncertain
He stopped, uncertain how to put the question tactfully.
,
suspicious
He has his father's suspicious nature.
,
hesitating
,
doubtful
Why did he sound so doubtful?
,
sceptical
scientists who are sceptical about global warming
,
tentative
My first attempts at complaining were very tentative.
,
wavering
,
hesitant
She was hesitant about coming forward with her story.
,
undecided
She was still undecided as to what career she wanted to pursue.
,
unconvinced
Most consumers seem unconvinced that the recession is over.
,
iffy (informal)
His political future is looking iffy.
,
leery (slang)
They are leery of the proposed system.
,
distrustful
Voters are distrustful of all politicians.
,
in two minds (informal)
Opposites
(adjective) 
Definition
not entirely honest, safe, or reliable
This is a very dubious honour.
Synonyms
doubtful
It seemed doubtful that he would move at all.
,
questionable
The film is a comedy in highly questionable taste.
,
ambiguous
His remarks clarify an ambiguous statement given earlier this week.
,
debatable
It is debatable whether or not they were ever properly compensated.
,
moot
How long he'll be able to do so is a moot point.
,
arguable
It is arguable whether he ever had much control.
,
equivocal
Her equivocal response gave nothing away.
,
open to question
,

Additional synonyms

in the sense of ambiguous
Definition
having more than one possible interpretation
His remarks clarify an ambiguous statement given earlier this week.
Synonyms
in the sense of arguable
It is arguable whether he ever had much control.
Synonyms
dodgy (British, Australian, New Zealand, informal),
unproven,
fishy (informal),
iffy (informal),
problematical,
controvertible,
dubitable
in the sense of crooked
Definition
dishonest or illegal
She might expose his crooked business deals to the authorities.

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Video: pronunciation of 'dubious'

Source

Thesaurus for dubious from the Collins English Thesaurus
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