Definition of unmistakable adjective from the Oxford Advanced American Dictionary

 

unmistakable

 adjective
(unmistakeable)adjective
NAmE//ˌʌnmɪˈsteɪkəbl//
 
 
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that cannot be mistaken for someone or something else Her accent was unmistakable. the unmistakable sound of gunfire
unmistakably(unmistakeably)
 
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NAmE//ˌʌnmɪˈsteɪkəbli//
 
adverb His accent was unmistakably British.
See the Oxford Advanced Learner's Dictionary entry: unmistakable