lastly vs tardily

lastly

adv
  • Used to signal that the speaker is about to yield control of the conversation. 

  • Used to mark the beginning of the last in a list of items or propositions. 

tardily

adv
  • in a tardy fashion; belatedly; late 

  • slowly 

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