Fail-safe and Questionable
Opposite meaning words
Fail-safe
Fail-safe adjective - Not likely to fail.
Usage example: men have traditionally regarded flowers as the fail-safe gift for Valentine's Day
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Synonyms for Fail-safe
Questionable is an antonym for fail-safe.
Questionable
Questionable adjective - Giving good reason for being doubted, questioned, or challenged.
Fail-safe is an antonym for questionable.
Cite this Source
Questionable and Fail-safe. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/fail-safe/questionable
Fail-safe & Questionable. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/fail-safe/questionable>.
Questionable or Fail-safe. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/fail-safe/questionable.
