Dubious
Dubious adjective - Giving good reason for being doubted, questioned, or challenged.
Usage example: any letter bearing the signature of Geronimo would be of dubious authenticity, to say the least
Questionable is a synonym for dubious in doubtful topic. In some cases you can use "Questionable" instead the word "Dubious" as an adjective or an adverb, when it comes to topics like suspicious, certain, suspect, difficult. popular alternative
Questionable
Questionable adjective - Giving good reason for being doubted, questioned, or challenged.
Usage example: the runner's unexpected first-place finish is questionable, so a drug test has been ordered
Dubious is a synonym for questionable in doubtful topic. You can use "Dubious" instead the word "Questionable" as an adjective or an adverb, if it concerns topics such as suspicious, certain, difficult, ambiguous. popular alternative
Mutual synonyms
Related pairs
- suspect and dubious
- suspect and questionable
- unclear and dubious
- unclear and questionable
- ambiguous and dubious
- ambiguous and questionable
- doubtful and dubious
- doubtful and questionable
- shady and dubious
- shady and questionable
- suspicious and dubious
- suspicious and questionable
- undecided and dubious
- undecided and questionable
Both words in one sentence
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However, the director based it on a fictional novel serialized in a Japanese Communist Party newspaper of questionable quality, to which can be traced the origins of many dubious facts regarding the Unit, as well as confusing the activities of Unit 100 with Unit 731.
Source: Film / Men Behind the Sun
Cite this Source
Questionable and Dubious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/dubious/questionable
Dubious & Questionable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/dubious/questionable>.
Questionable or Dubious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/dubious/questionable.
Google Ngram Viewer shows how "dubious" and "questionable" have occurred on timeline