goof off vs truant

goof off

verb
  • To dawdle, lollygag; to waste time aimlessly or engage in idle activity or inactivity. 

truant

verb
  • To idle away; to waste. 

  • To play truant. 

  • To idle away time. 

adj
  • Wandering from business or duty; straying; loitering; idle, and shirking duty. 

  • Absent without permission, especially from school. 

noun
  • One who is absent without permission, especially from school. 

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