Dictionary.com/brackish:

brackish (brksh) adjective

1. Having a somewhat salty taste, especially from containing a mixture of seawater and fresh water: “You could cut the brackish winds with a knife/Here in Nantucket” (Robert Lowell).
2. Distasteful; unpalatable: a thin, brackish gruel.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition

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