insensate vs surd

insensate

adj
  • Senseless; foolish; irrational. 

  • Not responsive to sensory stimuli. 

  • Unfeeling, heartless, cruel, insensitive. 

  • Having no sensation or consciousness; unconscious; inanimate. 

verb
  • To render insensate; to deprive of sensation or consciousness. 

noun
  • One who is insensate. 

surd

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

  • unvoiced; voiceless 

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

  • A voiceless consonant. 

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