careless vs on the ball

careless

adj
  • Not concerned or worried (about). 

  • Not giving sufficient attention or thought, especially concerning the avoidance of harm or mistakes. 

on the ball

prep
  • Alert, active, or attentive; on top of things. 

  • Playing as a midfielder. 

  • Being in control of the ball. 

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