Questionable
Questionable adjective - Giving good reason for being doubted, questioned, or challenged.
Trustworthy
Trustworthy adjective - Worthy of one's trust.
Usage example: a trustworthy bodyguard who would never blab to the tabloids
Questionable is an antonym for trustworthy.
Both words in one sentence
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Then again the person who said that is also the one who wanted to turn it into a bio-weapon, so it's questionable how trustworthy this is.
Source: No Biochemical Barriers - Casca in Julius Caesar, of "it was Greek to me" fame, acts like a moronic clod when around people with questionable motives - when around people who he knows are trustworthy, he becomes an intelligent, potent member of the conspiracy.
Source: Obfuscating Stupidity / Theatre
Cite this Source
Trustworthy and Questionable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/questionable/trustworthy
Questionable & Trustworthy. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/questionable/trustworthy>.
Trustworthy or Questionable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/questionable/trustworthy.
Google Ngram Viewer shows how "questionable" and "trustworthy" have occurred on timeline