unmistakable

Meanings

1. 1
   adj

   clearly evident to the mind

   Their opposition to slavery was unmistakable.

2. 2
   adj

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

   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.

3. 3
   adj

   clearly revealed to the mind or the senses or judgment

Etymology

From un- + mistake + -able.