smack-dab vs truly

smack-dab

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

truly

adv
  • Honestly, genuinely, in fact, really. 

  • In accordance with the facts; truthfully, accurately. 

  • Very. 

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