careful vs implex

careful

adj
  • Conscientious and painstaking; meticulous. 

  • Taking care; attentive to potential danger, error or harm; cautious. 

implex

adj
  • Intricate, involved, entangled, complicated, complex. 

noun
  • A genealogical coefficient of a given genealogical tree; defined as the difference between the number of theoretical ancestors of a person and the number of his/her real ones in a given generation (the degree of pedigree collapse). 

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