incoherent vs wandering

incoherent

adj
  • Not cohering socially, not united. 

  • Not making logical sense; not logically connected or consistent. 

wandering

noun
  • Disordered speech or delirium. 

  • Irregular turning of the eyes. 

  • Aimless thought. 

  • Travelling without preset route; roaming. 

  • Straying from a desired path. 

adj
  • Which wanders; travelling from place to place. 

  • Abnormally capable of moving in certain directions. 

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