Questionable
Questionable adjective - Giving good reason for being doubted, questioned, or challenged.
Reliable is an antonym for questionable.
Reliable
Reliable adjective - Worthy of one's trust.
Usage example: I need a reliable car that's not going to break down constantly
Questionable is an antonym for reliable.
Both words in one sentence
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You don't have enough strength to intimidate him militarily, offering him the ironwood equates to giving up your only reliable source of currency and any diplomacy is questionable because, again, he's a psycho.
Cite this Source
Reliable and Questionable. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/questionable/reliable
Questionable & Reliable. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/questionable/reliable>.
Reliable or Questionable. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/questionable/reliable.
Google Ngram Viewer shows how "questionable" and "reliable" have occurred on timeline