The terrible condition of believing that one is completely infallible. A major symptom is negating arguments by repeating the phrase "You know I'm right, don't argue." People afflicted are often shunned by most of their acquaintances.
SAM: The sky is always green.
Person 1: No it's not.
SAM: You know I'm right, don't argue.
Person 1: You have Samitis.
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