Skip to main content
dubious

dubious

88 6.5
Not clearly true or trustworthy and causing doubt
  • adjective
  • /ˈduːbiəs/
: dudoso
  • Many people found the research findings dubious, raising questions about their validity.
  • dubious claims
  • of dubious character
  • of dubious value

Your ex-husband sounds like a dubious man, but I mean that's wild.

Autoplay Next

Examples

  • And this stretcher is of dubious quality.

  • We spent a lot of money supporting this country for some very dubious reasons.

  • I mean the quality might be slightly dubious, but it works.

  • For that matter, the public is more than a little dubious about my role in this business.

    Fiction book (1993)
  • Captain George Williams had his own dubious past.

  • And AI experts were dubious about that.

  • So saying that it's causing more accidents is a dubious claim.

  • But I must tell you in all honesty, I'm extremely dubious about the results.

  • They are of dubious reliability to say the least.

  • There to witness this experiment were hundreds of spectators, many of them dubious of the whole enterprise.

    Academic text (2012)

Synonyms

skeptical
vsdubious
  • US
261 4.2

Not easily believing that something is true

can describe things that cause doubt rather than a doubting attitude
suspicious
vsdubious
261 2.7

Causing doubt because it seems wrong or illegal

also covers mere uncertainty or lack of reliability besides arousing doubt
in question
vsdubious
202 5.8

Not certain because people doubt or suspect it

can also describe something that actively causes suspicion rather than just being unresolved
questionable
vsdubious
162 3.9

Probably not true or trustworthy

is more general, also covering simple uncertainty not dishonesty
unreliable
vsdubious
78 4.1

Not able to be trusted to work or be right

also covers doubt caused by odd behaviour or possible dishonesty
suspect
vsdubious
78 5.3

Seen as probably dishonest or not trustworthy

can be used more widely for simple uncertainty without active mistrust
doubtful
vsdubious
54 3.0

Not likely to be true or real

adds stronger sense of causing suspicion or mistrust
uncertain
vsdubious
41 3.9

Not feeling sure or confident

often implies doubt caused by unreliability or suspicious signs
dodgy
vsdubious
  • UK
21 8.2

Likely to be unsafe or untrustworthy

is broader, also covering mild doubt or purely uncertain cases
untrustworthy
vsdubious
20 4.8

Not honest or reliable with promises

can also mean temporary doubt or mere lack of certainty rather than betrayal
a bit sketchy
vsdubious
  • Informal
1 8.6

A little suspicious and not easy to trust

can mean stronger doubt or clearer evidence of unreliability
doubty
vsdubious
  • Archaic
1 9.9

Not sure what will happen or what people will decide

is the modern, common sense that also includes suspicion and mistrust
sussy
vsdubious
  • Slang
1 9.9

A person or thing that seems dishonest and not trustworthy

is the neutral term that covers both casual doubt and formal suspicion
untrusty
vsdubious
  • Archaic
1 8.9

Not safe to depend on because they may fail or betray you

can include milder senses of being merely uncertain or questionable
dubitable
vsdubious
  • Formal
1 9.9

Not clearly true or certain

adds a sense of causing suspicion as well as mere doubt

Antonyms

342 2.7

Able to be trusted to do what is expected

87 2.1

A person or thing you can depend on to be honest

Compounds

dubious pelf
  • Archaic
9.9

Money gained in a dishonest or illegal way

How Trustworthy

trustworthy
87 2.1
honest
∞ 1.0
dubious
88 6.5
untrustworthy
20 4.8
dishonest
128 2.5

Surface Forms

dubious positive
dubiouser comparative
dubiousest superlative

Morphology

dubious = doubt (semi-transparent) = dubi + ous

The adjective clearly expresses a relation to 'doubt' via the suffix '-ous', but the form derives from Latin/French (dubi-) rather than productive English formation, so learners may only partially generalize from 'doubt'.

Etymology

Dubious comes from the Latin words dubius and dubitare, which are about 'doubt' and are linked to duo 'two' because they imagine a mind pulled between two choices. So if something is dubious, it is 'not certain' or 'suspicious', like when you have a strong doubt about it.