Etymology
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unmistakable (adj.)

1660s, from un- (1) "not" + mistake (v.) + -able. Related: Unmistakably.

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Definitions of unmistakable

unmistakable (adj.)
clearly evident to the mind;
his opposition to slavery was unmistakable
unmistakable (adj.)
clearly revealed to the mind or the senses or judgment;
From wordnet.princeton.edu