unmistakable

• unmistakeable

un- +‎ mistake +‎ -able

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unmistakable (comparative more unmistakable, superlative most unmistakable)

1. Unique, such that it cannot be mistaken for something else.

   Antonym: mistakable

   • 1895, H. G. Wells, The Time Machine Chapter X

     Now, I still think that for this box of matches to have escaped the wear of time for immemorial years was a strange, and for me, a most fortunate thing. Yet oddly enough I found here a far more unlikely substance, and that was camphor. I found it in a sealed jar, that, by chance, I supposed had been really hermetically sealed. I fancied at first the stuff was paraffin wax, and smashed the jar accordingly. But the odor of camphor was unmistakable.