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Definitions

dubious

[doo-bee-uhs, dyoo-] / ˈdu bi əs, ˈdyu- /
ADJECTIVE
doubtful
Synonyms
STRONGEST
arguable debatable equivocal fishy hesitant improbable problematic questionable reluctant shady skeptical suspicious uncertain unclear unconvinced unreliable unsure
WEAK
chancy diffident disputable dubitable far-fetched fly-by-night iffy indecisive moot mootable open perplexed suspect touch and go trustless unassured undecided undependable unlikely untrustworthy untrusty wavering
Antonyms
STRONGEST
aboveboard believable certain clear definite determined honest indubious likely probable secure sure trustworthy undoubted unquestionable
WEAK
doubtless positive reliable trusty unambiguous undoubtful unobscure
ADJECTIVE
vague, unclear
Synonyms
STRONGEST
ambiguous debatable doubtful equivocal problematic
WEAK
disinclined indefinite indeterminate mistrustful obscure open problematical undecided unsettled
Antonyms
STRONGEST
certain clear definite settled sure unquestionable
WEAK
doubtless positive reliable trustworthy trusty unambiguous undoubtful unobscure

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Rep. Randy Fine, R-Fla., may take the prize in this dubious category, however.

From Salon • Apr. 26, 2026

New thinking, rather than dubious prosecutions, is the shakeup the Fed needs.

From The Wall Street Journal • Apr. 24, 2026

Notice the base began with a dubious evening star pattern completed on March 31.

From Barron's • Apr. 8, 2026

The part where the laser guides the VSELs around Scott’s body is perhaps the most dubious of a procedure littered with doubt.

From Slate • Mar. 30, 2026

Mendel, despite his odd scientific lineage, and de Vries, despite his dubious personal hygiene, were right.

From "The Gene" by Siddhartha Mukherjee

Vocabulary lists containing dubious

The SAT: Words to Capture Tone, List 2

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Lord of the Flies

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The New SAT: Words to Capture Tone

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!