ill vs surd

ill

adj
  • Unpropitious, unkind, faulty, not up to reasonable standard. 

  • Unwell in terms of health or physical condition; sick. 

  • Sublime, with the connotation of being so in a singularly creative way. 

  • Indicative of unkind or malevolent intentions; harsh, cruel. 

  • Extremely bad (bad enough to make one ill). Generally used indirectly with to be. 

  • Having an urge to vomit. 

adv
  • Not well; imperfectly, badly 

noun
  • A physical ailment; an illness. 

  • Harm or injury. 

  • PCP, phencyclidine. 

  • Evil; moral wrongfulness. 

  • Trouble; distress; misfortune; adversity. 

verb
  • To behave aggressively. 

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