different between unmistakable vs decided

English

un- +? mistake +? -able

unmistakable (comparative more unmistakable, superlative most unmistakable)

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.

decided

decided (comparative more decided, superlative most decided)

determined; resolute
A woman of decided opinions
clear; unmistakable
There was a decided ugliness to the patch of waste ground.

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