Doubtful
Doubtful adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.
Unsubstantiated and doubtful are semantically related In some cases you can use "Unsubstantiated" instead an adjective "Doubtful".
Unsubstantiated
Unsubstantiated adjective - Having no basis in reason or fact.
Doubtful and unsubstantiated are semantically related in questionable topic. You can use "Doubtful" instead an adjective "Unsubstantiated", if it concerns topics such as unreliable.
Nearby Word: unsubstantially
Mutual synonyms
Related pairs
- suspect and doubtful
- suspect and unsubstantiated
- dubious and doubtful
- dubious and unsubstantiated
- questionable and doubtful
- questionable and unsubstantiated
- theoretical and doubtful
- theoretical and unsubstantiated
- suspicious and doubtful
- suspicious and unsubstantiated
- uncertain and doubtful
- uncertain and unsubstantiated
- unreliable and doubtful
- unreliable and unsubstantiated
Cite this Source
Unsubstantiated and Doubtful. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/doubtful/unsubstantiated
Doubtful & Unsubstantiated. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/doubtful/unsubstantiated>.
Unsubstantiated or Doubtful. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/doubtful/unsubstantiated.
Google Ngram Viewer shows how "doubtful" and "unsubstantiated" have occurred on timeline