manifestly vs obviously

manifestly

adv
  • In a manifest manner; obviously. 

obviously

adv
  • In an obvious or clearly apparent manner. 

  • Used as a filler word, or to introduce information even when not obvious. 

  • She was in floods of tears and obviously very upset. 

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