Origin: 1300–30; ME
mistaken (v.) < ON
mistaka to take in error.
See mis- 1 , take 
Related forms: mis⋅tak⋅er, noun
mis⋅tak⋅ing⋅ly, adverb
Synonyms:
1. inaccuracy, erratum, fault, oversight. Mistake, blunder, error, slip refer to deviations from right, accuracy, correctness, or truth. A mistake, grave or trivial, is caused by bad judgment or a disregard of rule or principle: It was a mistake to argue. A blunder is a careless, stupid, or gross mistake in action or speech, suggesting awkwardness, heedlessness, or ignorance: Through his blunder the message was lost. An error (often interchanged with mistake) is an unintentional wandering or deviation from accuracy, or right conduct: an error in addition. A slip is usually a minor mistake made through haste or carelessness: a slip of the tongue. 4. misconceive, misjudge, err.
Antonyms:
2. understanding.
[mi-steyk] 
noun, verb, -took, -tak⋅en, -tak⋅ing.