dubious
Americanadjective
-
doubtful; marked by or occasioning doubt.
a dubious reply.
-
of doubtful quality or propriety; questionable.
a dubious compliment; a dubious transaction.
-
of uncertain outcome.
in dubious battle.
-
wavering or hesitating in opinion; inclined to doubt.
adjective
-
marked by or causing doubt
a dubious reply
-
unsettled in mind; uncertain; doubtful
-
of doubtful quality; untrustworthy
a dubious reputation
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not certain in outcome
Related Words
See doubtful.
Other Word Forms
Etymology
Origin of dubious
First recorded in 1540–50; from Latin dubius; cf. doubt ( def. )
Explanation
Choose the adjective dubious for something you have doubts about or you suspect is not true. That bridge you just "bought" might be of dubious value. Dubious stems from Latin dubiosus, "doubtful" or "uncertain," and contains the Latin root duo in this case meaning "of two minds." This is apparent in that dubious generally describes something that appears one way but is truly another. A dubious claim is probably not true, whereas a dubious website or character is of questionable quality. Dubious can also be synonymous with doubtful, as in "she was dubious about the idea."
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
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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.
Cataloging what I have — and tossing anything expired, dubious or otherwise a little grim — feels like a miniature form of spring cleaning.
From Salon • May 12, 2026
Concern now rests upon multiple dubious candlesticks between March 16 and April 7, including three bearish engulfing candles and several dojis.
From Barron's • Apr. 27, 2026
The reconstituted group largely abandoned the framework, allowing the committee to judge evidence of dubious quality alongside large randomized controlled trials.
From Los Angeles Times • Apr. 14, 2026
Rather than trying to follow and spurring others to follow the dubious dictum “Don’t look away,” we should ask: “Why am I looking away?”
From The Wall Street Journal • Apr. 12, 2026
They are interested solely in confirming highly dubious theoretical hypotheses by the logic of analogy and induction, and make no attempt at refutation or intersubjective testing.’
From "The Chosen" by Chaim Potok
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
