Certain
Certain adjective - Impossible to avoid or evade.
Usage example: as he got older, the athlete began to feel the certain effects of the aging process on his body
Undependable is an antonym for certain.
Undependable
Undependable adjective - Not worthy of reliance or trust.
Usage example: an undependable assistant
Certain is an antonym for undependable.
Both words in one sentence
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The male ranger's passive, 'Sudden Death' had a chance to automatically kills monsters that have a certain amount of HP left but the chances of triggering are undependable (around 2% at the most), and any monster that is within the HP requirement are already close to being dead.
Cite this Source
Undependable and Certain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certain/undependable
Certain & Undependable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certain/undependable>.
Undependable or Certain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certain/undependable.
Google Ngram Viewer shows how "certain" and "undependable" have occurred on timeline