different between brackish vs blackish

English

From Scottish brack (from Dutch brak (“brackish”)) +? -ish.

brackish (comparative more brackish, superlative most brackish)

(of water) Salty or slightly salty, as a mixture of fresh and sea water, such as that found in estuaries.
- 1638 Herbert, Sir Thomas Some years travels into divers parts of Asia and Afrique
  ...by a low cour?e and too long ?porting with the briny Ocean it ta?ts bracki?h and in?alubrious...
- 1992, Joyce Carol Oates, Black Water, Penguin Books, paperback edition, page 4.
  On all sides a powerful brackish marshland odor, the odor of damp, and decay, and black earth, black water.
- 2004, David Mitchell, Cloud Atlas, Random House.
  The water we took on at Chatham Isle is now brackish & without a dash of brandy in it, my stomach rebels.
Distasteful; unpleasant; not appealing to the taste. (Can we add an example for this sense?)
Repulsive (Can we add an example for this sense?)

From Middle English blackysshe, blakkyssh, equivalent to black +? -ish.

blackish (comparative more blackish, superlative most blackish)

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