headlong vs surd

headlong

adj
  • Reckless, impetuous. 

  • Rushing forward without restraint. 

  • Precipitous. 

  • Plunging downwards head foremost. 

verb
  • To precipitate. 

adv
  • With an unrestrained forward motion. 

  • Rashly; precipitately; without deliberation; in haste, hastily. 

  • With the head first or down. 

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 headlong and surd occurred in a corpus of books? (source: Google Ngram Viewer )