Decisive and Questionable

Decisive

Decisive adjective - Serving to put an end to all debate or questioning.
Usage example: the decisive finding of the coroner regarding the cause of death

Questionable is an antonym for decisive.

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

Decisive is an antonym for questionable.

Cite this Source
Questionable and Decisive. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/decisive/questionable
Decisive & Questionable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/decisive/questionable>.
Questionable or Decisive. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/decisive/questionable.
Google Ngram Viewer shows how "decisive" and "questionable" have occurred on timeline