checked vs unpronounceable

checked

adj
  • Of syllables, having a coda. 

  • Verified or validated in some way. 

  • Delivered to the airline (or train line, ferry, etc.) during check-in to be stored in an inaccessible area to the passenger (the hold) during the flight (or other journey). 

  • Of consonants, glottalized. 

  • Having a pattern of checks; checkered. 

unpronounceable

adj
  • Impossible or difficult to pronounce or articulate. 

noun
  • Something difficult or impossible to pronounce. 

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