Arefusal to believe direct and highly credible evidence that your spouse is suffering a terminal illness best illustrates

Denial

Explanation:

According to my research on studies conducted by different psychologists, I can say that based on the information provided within the question this best illustrates a behavior of Denial. This (like defined in the question) is the inability to accept something as true. Denial is said to be the first stage of grief when dealing with loss or dying.

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the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.