smack-dab vs unmistakably

smack-dab

adv
  • Exactly in a place, especially the middle; directly; precisely; dead-center. 

unmistakably

adv
  • In an unmistakable manner; unquestionably. 

How often have the words smack-dab and unmistakably occurred in a corpus of books? (source: Google Ngram Viewer )