barren vs surd

barren

adj
  • Unproductive; fruitless; unprofitable; empty. 

  • Unable to bear children; sterile. 

  • Of poor fertility, infertile; not producing vegetation. 

  • Mentally dull; stupid. 

  • Bleak. 

noun
  • An area of low fertility and habitation, a desolate place. 

surd

adj
  • unvoiced; voiceless 

  • Involving surds, or irrational numbers; not capable of being expressed in rational numbers. 

noun
  • An irrational number, especially one expressed using the √ symbol. 

  • A voiceless consonant. 

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