What is another word for knowing for certain?
Pronunciation: [nˈə͡ʊɪŋ fɔː sˈɜːtən] (IPA) 
When we seek to convey the idea of knowing for certain, there are a few synonyms that come to mind. Words like "sure," "certain," and "confident" can convey the sense of conviction and certainty that comes with knowing something to be true. "Convinced," "assured," and "positive" all suggest that there is no doubt in one's mind about a particular fact or truth. "Unquestionable" and "undisputed" assert that there can be no debate or argument about the certainty of a given proposition. Whatever the circumstance, these synonyms offer us ways to communicate our sense of absolute certainty to others.
