competent vs insufficient

competent

adj
  • Having sufficient skill, knowledge, ability, or qualifications. 

  • Resistant to deformation or flow. 

  • Having jurisdiction or authority over a particular issue or question. 

  • Adequate for the purpose. 

  • Permeable to foreign DNA. 

insufficient

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. 

det
  • An inadequate quantity of; not enough. 

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

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