Doubtful
Doubtful adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.
Doubtfully and doubtful are semantically related. In some cases you can use "Doubtfully" instead an adverb "Doubtful".
Doubtfully
Doubtfully adverb - With distrust.
Doubtful and doubtfully are semantically related. Sometimes you can use "Doubtful" instead an adverb "Doubtfully".
Mutual synonyms
Cite this Source
Doubtfully and Doubtful. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/doubtful/doubtfully
Doubtful & Doubtfully. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/doubtful/doubtfully>.
Doubtfully or Doubtful. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/doubtful/doubtfully.
Google Ngram Viewer shows how "doubtful" and "doubtfully" have occurred on timeline