brackish vs immobile

brackish

adj
  • Distasteful; unpleasant; not appealing to the taste. 

  • Repulsive 

  • Salty or slightly salty, as a mixture of fresh and sea water, such as that found in estuaries. 

immobile

adj
  • fixed, unable to be moved 

  • not mobile, not movable 

How often have the words brackish and immobile occurred in a corpus of books? (source: Google Ngram Viewer )