Doubtful and Reliable

Doubtful

Doubtful adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.

Reliable is an antonym for doubtful.

Reliable

Reliable adjective - Worthy of one's trust.
Usage example: I need a reliable car that's not going to break down constantly

Doubtful is an antonym for reliable.

Cite this Source
Reliable and Doubtful. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/doubtful/reliable
Doubtful & Reliable. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/doubtful/reliable>.
Reliable or Doubtful. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/doubtful/reliable.
Google Ngram Viewer shows how "doubtful" and "reliable" have occurred on timeline