How do you use certitude in a sentence?

Here are a few examples of how to use "certitude" in a sentence:

* Formal: "The scientist spoke with a certitude that belied the complexity of the research."

* Informal: "Despite the evidence, she held onto her certitude that her theory was correct."

* Literary: "The old man's eyes, clouded with age, held a strange certitude that frightened the young boy."

* With a synonym: "The detective approached the case with absolute certainty (or absolute certitude)."

Certitude means absolute certainty or conviction. It implies a strong belief that something is true, without any doubt or hesitation.