ultimate vs unknown

ultimate

noun
  • The most basic or fundamental of a set of things 

  • The greatest extremity; the maximum 

  • The final or most distant point; the conclusion 

adj
  • Being the most distant or extreme; farthest. 

  • That will happen at some time; eventual. 

  • Final; last in a series. 

  • Last in a word or other utterance. 

  • Being the greatest possible; maximum; most extreme. 

  • Last in a train of progression or consequences; tended toward by all that precedes; arrived at, as the last result; final. 

  • Incapable of further analysis; incapable of further division or separation; constituent; elemental. 

unknown

noun
  • Any thing, place, or situation about which nothing is known; an unknown fact or piece of information. 

  • A variable (usually x, y or z) whose value is to be found. 

  • A person of no identity; a nonentity 

adj
  • Not known; unidentified; not well known. 

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