insufficient vs proportional

insufficient

det
  • An inadequate quantity of; not enough. 

  • A quantity (of something) that is less than is needed. 

adj
  • Not sufficient; lacking competent power or ability; unqualified, unequal, unfit. 

  • Not sufficient; of a type or kind that does not suffice, that does not satisfy requirements or needs. 

proportional

adj
  • In proportion (to), proportionate. 

  • Of a typeface, having characters with natural (non-uniform) width (in contrast to monospace typefaces). 

  • At a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first. Symbol: ∝. 

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