mistake
noun
an error in action, calculation, opinion, or judgment caused by poor reasoning, carelessness, insufficient knowledge, etc.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Ah, that foolish dream of mine had proven true: I knew her, I knew her, unmistaking, without doubt or hesitancy—and in the dark!
From The Beautiful Lady by Booth Tarkington