Certainty and Doubt - Confidence and Surety

something that will surely happen

to make certain of or to guarantee something

according to facts instead of opinions

in a definite and clear manner due to being based on facts instead of ideas or guesses

the belief in one's own ability to achieve goals and get the desired results

having a strong belief in one's abilities or qualities

in a way that shows confidence and trust in oneself or another person's abilities, plans, etc.

a belief or opinion that is very strong

having a strong belief in something

to put trust in something or someone

to check the accuracy or validity of something by using alternative sources or methods

‌an act of determining the accuracy or credibility of something by comparing it with various sources

in a way that is certain and beyond any doubt

certainly happening and unlikely to change

(of a person) firm and clear in thoughts, decisions, or actions

in a certain way

to have confidence or trust in someone or something

convinced that everything one believes in is true and others are wrong

in a critical and arrogant manner therefore refusing to consider other's opinions

to make sure that something will happen

to believe something strongly, even though one cannot explain why

something that is assumed to be true or already decided upon before any evidence or arguments are presented

to understand something completely and clearly

to make sure that something will occur

something that makes certain of a given result

a person who officially makes a promise or gives assurance to be accountable for someone or the occurrence of something