certain exercising or taking care great enough to bring assurance; "be certain to disconnect the iron when you are through"; "be sure to lock the doors"
uncertain ambiguous (especially in the negative); "she spoke in no uncertain terms"
quality an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
moral certainty certainty based on an inner conviction; "she believed in the importance of moral absolutes and moral certainty"; "the prosecutor had a moral certainty that the prisoner was guilty"
certain,
sure exercising or taking care great enough to bring assurance; "be certain to disconnect the iron when you are through"; "be sure to lock the doors"
Certainty can be defined as either (a) perfect knowledge that has total security from error, or (b) the mental state of being without doubt. Objectively defined, certainty is total continuity and validity of all foundational inquiry, to the highest degree of precision. Something is certain only if no skepticism can occur.