facetiously vs heedlessly

facetiously

adv
  • In a facetious or flippant manner; in a manner that treats serious issues with deliberately inappropriate humor 

heedlessly

adv
  • In a heedless manner: with unawareness; without noticing; carelessly, inattentively. 

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