no-go vs unattainable

no-go

adj

  • Not functioning properly. 

  • Of a place, not to be entered. 

unattainable

adj

  • Impossible to attain or reach; unable to accomplish 

noun

  • Anything that cannot be attained. 

How often have the words no-go and unattainable occurred in a corpus of books? (source: Google Ngram Viewer )