certainty

1 a state of mind in which one is free from doubt I have full certainty that I'll pass the test Synonyms assurance, assuredness, confidence, certitude, cocksureness, conviction, doubtlessness, face, positiveness, satisfaction, sureness, suretyRelated Words authoritarianism, dogmatism; decisiveness, determination, firmness, purposefulness, resoluteness, resolution, resolveNear Antonyms hesitancy, hesitation, indecisiveness, irresolution; disbelief, incredulity, unbelief; anxiety, concern, misgiving; distrust, mistrust, suspicionAntonyms doubt, incertitude, nonconfidence, uncertainty

2 the quality or state of being impossible to avoid or evade the proverbial certainty of death and taxes Synonyms inevitability, ineluctability, inevitablenessRelated Words likelihood, probability; inexorability, inexorableness, relentlessnessNear Antonyms preventability; improbability, unlikelihood, unlikeliness; doubtfulness, dubiousnessAntonyms uncertainty