lax vs tough

lax

adj
  • Loose; not tight or taut. 

  • Lacking care; neglectful, negligent. 

  • Lenient and allowing for deviation; not strict. 

  • Describing an associative monoidal functor. 

noun
  • Lacrosse. 

  • A salmon. 

tough

adj
  • Rugged or physically hardy. 

  • Harsh or severe. 

  • Difficult or demanding. 

  • Stubborn or persistent; capable of stubbornness or persistence. 

  • Strong and resilient; sturdy. 

  • Undergoing plastic deformation before breaking. 

  • Difficult to cut or chew. 

  • Rowdy or rough. 

verb
  • To endure. 

  • To toughen. 

noun
  • A person who obtains things by force; a thug or bully. 

intj
  • Used to indicate lack of sympathy 

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