timely vs unpunctual

timely

adv

  • In compliance with applicable time limits. 

adj

  • Done at the proper time or within the proper time limits; prompt. 

  • Happening or appearing at the proper time. 

unpunctual

adj

  • Not punctual. 

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